EP2463378A1 - Alpha Isomaltosylglucosaccharid-Synthase, Herstellungsverfahren und Verwendung davon - Google Patents

Alpha Isomaltosylglucosaccharid-Synthase, Herstellungsverfahren und Verwendung davon Download PDF

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Publication number
EP2463378A1
EP2463378A1 EP20100184877 EP10184877A EP2463378A1 EP 2463378 A1 EP2463378 A1 EP 2463378A1 EP 20100184877 EP20100184877 EP 20100184877 EP 10184877 A EP10184877 A EP 10184877A EP 2463378 A1 EP2463378 A1 EP 2463378A1
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Prior art keywords
enzyme
isomaltosylglucosaccharide
cyclotetrasaccharide
isomaltosyl
activity
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EP20100184877
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English (en)
French (fr)
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EP2463378B1 (de
Inventor
Michio Kubota
Keiji Tsusaki
Takanobu Higashiyama
Shigeharu Fukuda
Toshio Miyake
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Hayashibara Co Ltd
Original Assignee
Hayashibara Seibutsu Kagaku Kenkyujo KK
Hayashibara Biochemical Laboratories Co Ltd
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Definitions

  • the present invention relates to a novel ⁇ -isomaltosylglucosaccharide-forming enzyme, process and uses of the same, more particularly, to a novel ⁇ -isomaltosylglucosaccharide-forming enzyme, process for producing the enzyme, ⁇ -glucosyl-transferring method using the enzyme, process for producing a cyclotetrasaccharide having the structure of cyclo ⁇ ® 6)- ⁇ -D-glucopyranosyl-(1 ® 3)- ⁇ -D-glucopyranosyl-(1 ® 6)- ⁇ -D-glucopyranosyl-(1 ® 3)- ⁇ -D-glucopyranosyl-(1 ® ⁇ using both the enzyme and an ⁇ -isomaltosyl-transferring enzyme, and compositions comprising these saccharides.
  • saccharides composed of glucose molecules as constituent saccharides for example, partial starch hydrolysates, produced from starches as materials, including amylose, amylodextrin, maltodextrin, maltooligosaccharide, and isomaltooligosaccharide.
  • these saccharides are known to have usually reducing and non-reducing groups at their molecular ends and exhibit reducibility.
  • partial starch hydrolysates can be expressed with an index of dextrose equivalent (DE), a scale of reducing power based on the dry solid.
  • DE dextrose equivalent
  • trehalose composed of two glucose molecules linked together via the ⁇ , ⁇ -linkage
  • a non-reducing saccharide-forming enzyme and a trehalose-releasing enzyme with partial starch hydrolysates such as maltooligosaccharide.
  • trehalose has been industrially produced from starches and used in different fields by using its advantageous non-reducibility, mild- and high quality-sweetness.
  • trehalose having a glucose polymerization degree (DP) of two, and ⁇ -, ⁇ -, and ⁇ -cyclodextrins having a DP of 6-8 are produced on an industrial scale and used in view of their advantageous properties, however, the types of non- or low-reducing saccharides are limited, so that more diversified saccharides other than these saccharides are greatly required.
  • Cyclotetrasaccharide or a non-reducing saccharide having a cyclic structure exhibits an inclusion ability to stabilize volatile organic compounds, and does not cause an amino carbonyl reaction, and therefore it is expected to be used and processed with lesser fear of browning and deterioration.
  • the present inventors succeeded in producing cyclotetrasaccharide by contacting, as a material, a saccharide having the ⁇ -1,6 glucosidic linkage as a linkage of non-reducing end and having a glucose polymerization degree of at least three (may be called " ⁇ -isomaltosylglucosaccharide" throughout the specification) with an ⁇ -isomaltosyl-transferring enzyme which specifically hydrolyzes the ⁇ -isomaltosyl moiety and the resting glucosylsaccharide moiety and then transfers the ⁇ -isomaltosyl moiety to its acceptor to form cyclotetrasaccharide, as disclosed in Japanese Patent Application Nos.
  • the ⁇ -isomaltosyl-transferring enzyme is an enzyme which forms cyclotetrasaccharide from ⁇ -isomaltoglucosaccharide by ⁇ -isomaltosyl-transferring reaction and has the following physicochemical properties:
  • ⁇ -isomaltosyl-transferring enzyme does not directly act on starches, the following procedure is actually employed: Starches are first converted into such an ⁇ -isomaltosylglucosaccharide having the above specified structure, for example, relatively-low molecular weight isomaltooligosaccharides such as panose and isomaltosylmaltose, and then subjected to the action of ⁇ -isomaltosyl-transferring enzyme to form cyclotetrasaccharide.
  • the yield of the saccharide from the material is about 44% to the material, based on the weight of the dry solid (d.s.b.).
  • the yield of cyclotetrasaccharide is about 31%, d.s.b.
  • enzymes such as ⁇ -amylase, starch debranching enzyme, ⁇ -amylase, and ⁇ -glucosidase to form relatively-low molecular weight isomaltooligosaccharides including panose, and the yield of cyclotetrasaccharide is quite as low as about 15%, d.s.b.
  • the object of the present invention is to provide an ⁇ -isomaltosylglucosaccharide-forming enzyme, process of the same, cyclotetrasaccharide obtainable therewith, saccharides comprising cyclotetrasaccharide, and uses thereof.
  • the present inventors widely screened microorganisms, which produce a novel enzyme usable for preparing cyclotetrasaccharide from starches as a material in a relatively high yield, with an expectation of obtaining such an enzyme.
  • the present inventors accomplished this invention by firstly finding the fact that the yield of cyclotetrasaccharide, aimed at by the present inventors, can be greatly improved by contacting relatively-low molecular weight glucosyl saccharides which include partial starch hydrolysates with ⁇ -isomaltosylglucosaccharide-forming enzyme and ⁇ -isomaltosyl-transferring enzyme; revealed the properties of ⁇ -isomaltosylglucosaccharide-forming enzyme, and preparation method of ⁇ -isomaltosylglucosaccharide-forming enzyme; ⁇ -glucosyl-transferring reaction using ⁇ -isomaltosylglucosaccharide-forming enzyme, process for producing ⁇ -isomaltosylglucosaccharide; cyclo
  • Characteristics of cells when incubated at 27_C in nutrient broth agar Existing usually in a rod shape of 0.5-1.0x1.5-5 ⁇ m, Exhibiting no polymorphism, Possessing motility, Forming spherical spores at an intracellular end and swelled sporangia, and Gram stain, positive;
  • the microorganism had a feature, not disclosed in any literature, of forming both ⁇ -isomaltosylglucosaccharide-forming enzyme, which produces ⁇ -isomaltosylglucosaccharide from partial starch hydrolyzates, and ⁇ -isomaltosyl-transferring enzyme which produces cyclotetrasaccharide from ⁇ -isomaltosylglucosaccharide by transferring ⁇ -isomaltosyl residue.
  • this microorganism “Bacillus globisporus C9", and deposited it on April 25, 2000, in International Patent Organism Depositary National Institute of Advanced Industrial Science and Technology Tsukuba Central 6, 1-1, Higashi 1-Chome Tsukuba-shi, Ibaraki-ken, 305-8566, Japan.
  • the deposition of the microorganism was accepted on the same day by the institute under the accession number of FERM BP-7143.
  • Characteristics of cells when incubated at 27_C in nutrient broth agar Existing usually in a rod shape of 0.5-1.0x1.5-5 ⁇ m, Exhibiting no polymorphism, Possessing motility, Forming spherical spores at an intracellular end and swelled sporangia, and Gram stain, positive;
  • the microorganism had a feature, not disclosed in any literature, of forming both ⁇ -isomaltosylglucosaccharide-forming enzyme, which produces ⁇ -isomaltosylglucosaccharide from partial starch hydrolyzates, and ⁇ -isomaltosyl-transferring enzyme which produces cyclotetrasaccharide from the ⁇ -isomaltosylglucosaccharide by transferring ⁇ -isomaltosyl residue.
  • this microorganism “Bacillus globisporus C11", and deposited it on April 25, 2000, in International Patent Organism Depositary National Institute of Advanced Industrial Science and Technology Tsukuba Central 6, 1-1, Higashi 1-Chome Tsukuba-shi, Ibaraki-ken, 305-8566, Japan.
  • the deposition of the microorganism was accepted on the same day by the institute under the accession number of FERM BP-7144.
  • Characteristics of cells when incubated at 27_C in nutrient broth agar Existing usually in a rod form of 0.5-1.0x1.5-5 ⁇ m, Exhibiting no polymorphism, Possessing motility, Forming spherical spores at an intracellular end and swelled sporangia, and Gram stain, positive;
  • the microorganism had a feature, not disclosed in any literature, of forming both ⁇ -isomaltosylglucosaccharide-forming enzyme, which produces ⁇ -isomaltosylglucosaccharide from partial starch hydrolyzates, and ⁇ -isomaltosyl-transferring enzyme which produces cyclotetrasaccharide from the ⁇ -isomaltosylglucosaccharide by transferring ⁇ -isomaltosyl residue.
  • this microorganism “Bacillus globisporus N75", and deposited it on May 16, 2001, in International Patent Organism Depositary National Institute of Advanced Industrial Science and Technology Tsukuba Central 6, 1-1, Higashi 1-Chome Tsukuba-shi, Ibaraki-ken, 305-8566, Japan.
  • the deposition of the microorganism was accepted on the same day by the institute under the accession number of FERM BP-7591.
  • the microorganism had a feature, not disclosed in any literature, of forming both ⁇ -isomaltosylglucosaccharide-forming enzyme, which produces ⁇ -isomaltosylglucosaccharide from partial starch hydrolyzates, and ⁇ -isomaltosyl-transferring enzyme which produces cyclotetrasaccharide from the ⁇ -isomaltosylglucosaccharide by transferring ⁇ -isomaltosyl residue.
  • this microorganism "Arthrobacter globiformis A19", and deposited it on May 16, 2001, in International Patent Organism Depositary National Institute of Advanced Industrial Science and Technology Tsukuba Central 6, 1-1, Higashi 1-Chome Tsukuba-shi, Ibaraki-ken, 305-8566, Japan.
  • the deposition of the microorganism was accepted on the same day by the institute under the accession number of FERM BP-7590.
  • any microorganisms of the genera Bacillus, Arthrobacter, and others, as well as their mutants can be appropriately used as long as they form ⁇ -isomaltosylglucosaccharide-forming enzyme.
  • These microorganisms can be easily screened by using conventional screening methods for microorganisms with an index of the physicochemical properties of the ⁇ -isomaltosylglucosaccharide-forming enzyme of the present invention.
  • S1 An ⁇ -isomaltosyl-transferring enzyme derived from a microorganism of the genus Arthrobacter (hereinafter may be called "Strain S1"), isolated by the present inventors from a soil in Okayama-shi, Okayama, Japan, can be advantageously used in the present invention as the ⁇ -isomaltosyl-transferring enzyme which produces cyclotetrasaccharide from ⁇ -isomaltosylglucosaccharide by transferring ⁇ -isomaltosyl residue.
  • strain S1 An ⁇ -isomaltosyl-transferring enzyme derived from a microorganism of the genus Arthrobacter
  • the microorganism had a feature, not disclosed in any literature, forming both ⁇ -isomaltosylglucosaccharide-forming enzyme, which produces ⁇ -isomaltosylglucosaccharide from partial starch hydrolyzates, and ⁇ -isomaltosyl-transferring enzyme which produces cyclotetrasaccharide from the ⁇ -isomaltosylglucosaccharide by transferring ⁇ -isomaltosyl residue.
  • this microorganism "Arthrobacter ramosus S1", and deposited it on May 16, 2001, in International Patent Organism Depositary National Institute of Advanced Industrial Science and Technology Tsukuba Central 6, 1-1, Higashi 1-Chome Tsukuba-shi, Ibaraki-ken, 305-8566, Japan.
  • the deposition of the microorganism was accepted on the same day by the institute under the accession number of FERM BP-7592.
  • any mutant of Arthrobacter ramosus S1 can be appropriately used in the present invention as long as it forms ⁇ -isomaltosylglucosaccharide-forming enzyme.
  • Such a mutant can be easily screened by conventional screening methods for microorganisms with an index of the physicochemical properties of the ⁇ -isomaltosyl-transferring enzyme usable the present invention.
  • Any nutrient culture medium can be used in the invention as long as the above-mentioned microorganisms can grow therein and produce the ⁇ -isomaltosylglucosaccharide-forming enzyme; synthetic- and natural-nutrient culture media can be arbitrarily used.
  • the carbon sources usable in the present invention are those which the microorganisms assimilate for their growth: Examples such are starches and phytoglycogen from plants; glycogen and pullulan from animals and microorganisms; saccharides such as glucose, fructose, lactose, sucrose, mannitol, sorbitol, and molasses; and organic acids such as citric acid and succinic acid.
  • the concentrations of these carbon sources in nutrient culture media are appropriately changed depending on their kinds.
  • the nitrogen sources usable in the present invention are, for example, inorganic nitrogen compounds such as ammonium salts and nitrates; and organic nitrogen-containing substances such as urea, corn steep liquor, casein, peptone, yeast extract, and beef extract.
  • the inorganic ingredients usable in the present invention are, for example, calcium salts, magnesium salts, potassium salts, sodium salts, phosphates, and other salts of manganese, zinc, iron, copper, molybdenum, and cobalt. If necessary, amino acids and vitamins can be appropriately used in combination.
  • the microorganisms used in the present invention are cultured under aerobic conditions at temperatures, usually, in the range of 4-40_C, preferably, 20-37_C; and at pHs of 4-10, preferably, pHs of 5-9.
  • the cultivation time used in the present invention is set to a time or longer than that required for the growth initiation of the microorganisms, preferably, 10-150 hours.
  • the concentration of dissolved oxygen (DO) in nutrient culture media is not specifically restricted, but usually it is in the range of 0.5-20 ppm and it can be kept within the range by means of controlling the level of aeration, stirring, adding oxygen to air, and increasing the inner pressure of fermentors.
  • the cultivation is freely carried out batchwise or in continuous manner.
  • the enzyme of the present invention is collected.
  • the latter can be collected as crude enzyme solutions and the intact cultures can be used as crude enzyme solutions.
  • Conventional liquid-solid separation methods can be employed to remove cells from the cultures; methods to centrifuge the cultures, filtrate the cultures with precoat filters, and filter with plane filters or follow fibers can be appropriately used to remove cells from the cultures.
  • cell-free cultures can be used as crude enzyme solutions, however, they may be concentrated prior to use by salting out using ammonium sulfate, sedimentation using acetone and alcohol, concentration in vacuo, and concentration using plane membranes and hollow fibers.
  • Cell-free solutions and their concentrates which contain the enzyme of the present invention, can be used intact or after immobilizing the enzyme using conventional methods.
  • conjugation methods using ion-exchangers for example, conjugation methods using ion-exchangers, covalent bonding/adsorption methods using resins and membranes, and inclusion methods using high-molecular weight substances can be appropriately employed.
  • the enzyme solutions usually contain the ⁇ -isomaltosylglucosaccharide-forming enzyme of the present invention and ⁇ -isomaltosyl-transferring enzyme. If necessary, the ⁇ -isomaltosylglucosaccharide-forming enzyme of the present invention can be used after being separated/purified by conventional methods.
  • an electrophoretically homogenous ⁇ -isomaltosylglucosaccharide-forming enzyme according to the present invention can be obtained by salting out to concentrate the enzyme in the cultures, dialyzing the concentrated crude enzyme, purifying the dialyzed solution by sequential chromatographies of anion-exchange column chromatography using a resin of "SEPABEADS FP-DA13", affinity chromatography using a gel of "SEPHACRYL HR S-200", hydrophobic chromatography using a gel of "BUTYL-TOYOPEARL 650M”, and affinity chromatography using a gel of "SEPHACRYL HR S-200".
  • the ⁇ -isomaltosylglucosaccharide-forming enzyme of the present invention has the characteristic physicochemical properties that it forms, via the ⁇ -glucosyl-transfer, a saccharide, which has a glucose polymerization degree of at least three and has both the ⁇ -1,6 glucosidic linkage as a linkage at the non-reducing end and the ⁇ -1,4 glucosidic linkage other than the above linkage, from a material saccharide which has a glucose polymerization degree of at least two and has the ⁇ -1,4 glucosidic linkage as a linkage at the non-reducing end, without substantially increasing the reducing power of the material saccharide; it has no dextran-forming ability; and it is inhibited by EDTA (ethylenediaminetetraacetic acid).
  • EDTA ethylenediaminetetraacetic acid
  • the enzyme has the physicochemical properties as shown in the below; and the saccharide, which has both a glucose polymerization degree of at least two and the ⁇ -1,4 glucosidic linkage as a linkage at the non-reducing end, includes, for example, one or more saccharides selected from maltooligosaccharides, maltodextrins, amylodextrins, amyloses, amylopectins, soluble starches, gelatinized starches, and glycogens:
  • the substrates usable for the ⁇ -isomaltosyl-glucosaccharide-forming enzyme of the present invention include polysaccharides having the 1,4-glucosidic linkage such as starches, amylopectins, amyloses, and glycogens; and partial starch hydrolyzates such as amylodextrins, maltodextrins, and maltooligosaccharides obtainable by partially hydrolyzing the above polysaccharides with amylases, acids, etc.
  • glucosyl saccharides having the ⁇ -1,4 glucosidic linkage can be further treated with a branching enzyme (EC 2.4.1.18) such as a branching enzyme for the substrates.
  • partial starch hydrolyzates of glucosyl saccharides treated with amylases are those which are hydrolyzed with ⁇ -amylase (EC 3.2.1.1), ⁇ -amylase (EC 3.2.1.2), maltotriose-forming enzyme (EC 3.2.1.116), maltotetraose-forming enzyme (EC 3.2.1.60), maltopentaose-forming enzyme, and maltohexaose-forming amylase (EC 3.2.1.98) as disclosed in " Handbook of Amylases and Related Enzymes", published by Pergamon Press, Tokyo, Japan (1988 ).
  • debranching enzymes such as pulullanase (EC 3.2.1.41) and isoamylase (EC 3.2.1.68) can be arbitrarily used.
  • the starches as the substrates include terrestrial starches from crops such as corns, wheats, and rices; and subterranean starches such as potatoes, sweet potatoes, and tapioca.
  • these starches are gelatinized and/or liquefied into a liquid form in use.
  • the acceptors for transferring reaction by the ⁇ -isomaltosylglucosaccharide-forming enzyme of the present invention include the above substrates per se, monosaccharides such as glucose, xylose, galactose, fructose, arabinose, fucose, sorbose, and N-acetylglucosamine; oligosaccharides such as trehalose, isomaltose, isomaltotriose, cellobiose, gentibiose, lactose, and sucrose; and others such as maltitol and L-ascorbic acid.
  • monosaccharides such as glucose, xylose, galactose, fructose, arabinose, fucose, sorbose, and N-acetylglucosamine
  • oligosaccharides such as trehalose, isomaltose, isomaltotriose, cellobiose, gent
  • the concentration of substrates is not specifically restricted, and the enzymatic reaction of the present invention proceeds even when used in a low concentration as low as 0.1% (w/w) (throughout the specification, "% (w/w)" is abbreviated as “%” hereinafter, unless specified otherwise). However, one percent or higher concentrations are preferably used for an industrial scale production.
  • the substrate solutions may be those in a suspension form which contain incompletely-dissolved insoluble substrates.
  • the substrate concentration is preferably 40% or lower, and more preferably, 30% or lower.
  • the temperatures for the enzymatic reaction used in the present invention are those which proceed the enzymatic reaction, i.e., those up to about 65_C, preferably, about 30_C to about 55_C.
  • the pHs for the enzymatic reaction are usually set to 4.5-10, preferably, about 5.5 to about 9.
  • the time for the enzymatic reaction can be appropriately set depending on the enzymatic reaction efficiency.
  • ⁇ -isomaltosylglucosaccharide formed by the above enzymatic reaction By contacting the ⁇ -isomaltosylglucosaccharide formed by the above enzymatic reaction with ⁇ -isomaltosyl-transferring enzyme, cyclotetrasaccharide is produced in a satisfactorily yield.
  • the ⁇ -isomaltosyl-transferring enzyme can be allowed to act on substrates after the action and the inactivation of the ⁇ -isomaltosylglucosaccharide-forming enzyme of the present invention.
  • these ⁇ -isomaltosylglucosaccharide-forming enzyme and ⁇ -isomaltosyl-transferring enzyme can be used in combination to facilitate the production of cyclotetrasaccharide from starches or partial hydrolyzates thereof in a high yield of about 30%, d.s.b., or higher, and the production from glycogen in a yield of about 80%, d.s.b., or higher.
  • the formation mechanism of cyclotetrasaccharide by the above combination use can be estimated as follows based on the reaction properties of the two enzymes:
  • the ⁇ -isomaltosylglucosaccharide-forming enzyme of the present invention and ⁇ -isomaltosyl-transferring enzyme repeatedly act on their substrates to increase the yield of cyclotetrasaccharide.
  • cyclotetrasaccharide-forming reaction optionally, other saccharide-transferring enzyme(s) can be advantageously used in combination to improve the yield of cyclotetrasaccharide; when two types of enzymes, i.e., ⁇ -isomaltosylglucosaccharide-forming enzyme and ⁇ -isomaltosyl-transferring enzyme are allowed to act, for example, on an about 15% solution of partial starch hydrolyzate, cyclotetrasaccharide is produced in a yield of about 55%, while the use of three types of enzymes, i.e., ⁇ -isomaltosylglucosaccharide-forming enzyme, ⁇ -isomaltosyl-transferring enzyme, and cyclomaltodextrin glucanotransferase, under the same conditions as above, increases the maximum yield of cyclotetrasaccharide by about 5-10% to an improved yield of about 60-65%.
  • two types of enzymes i
  • cyclomaltodextrin it can be produced by culture methods using microorganisms capable of forming both ⁇ -isomaltosylglucosaccharide-forming enzyme and ⁇ -isomaltosyl-transferring enzyme which specifically hydrolyzes the linkage between the ⁇ -isomaltosyl moiety and the resting glucosylsaccharide moiety of ⁇ -isomaltosylglucosaccharide formed by the ⁇ -isomaltosylglucosaccharide-forming enzyme, and then transfers the released ⁇ -isomaltosyl moiety to an acceptor.
  • any synthetic or natural media can be used as long as they contain saccharides having a glucose polymerization degree of at least two and having the ⁇ -1,4 glucosidic linkage as a linkage at the non-reducing end and in which the microorganisms can grow.
  • those which are used to form the ⁇ -isomaltosylglucosaccharide-forming enzyme of the present invention can be employed.
  • the cultures obtained by the above enzymatic reaction and culture, can be used intact as solutions comprising cyclotetrasaccharide or saccharide compositions of the same.
  • they can be purified before use in such a manner of using one or more of the following purification methods alone or in combination: Decoloration with activated charcoal, desalting by ion-exchange resins in a H or OH form, and column chromatographies such as ion-exchange column chromatography, column chromatography using activated charcoal, and silica gel column chromatography, separation using organic solvents such as alcohols and acetone, membrane separation using adequate separability, hydrolysis of the remaining saccharides using enzymes such as amylases including ⁇ -amylase, ⁇ -amylase, glucoamylase (EC 3.2.1.3), and ⁇ -glucosidase (EC 3.2.1.20), and hydrolysis and removal of the remaining saccharides by fermentation with yeasts or by alkaline treatment.
  • ion-exchange column chromatography is preferably used as an industrial scale production method; column chromatography using strong-acid cation exchange resins as disclosed, for example, in Japanese Patent Kokai Nos. 23,799/83 and 72,598/83 .
  • the contaminating saccharides can be removed to advantageously produce cyclotetrasaccharide with an improved content of the objective saccharide or saccharide compositions comprising the same.
  • any one of fixed-bed, moving bed, and semi-moving bed methods can be appropriately used.
  • the resulting cyclotetrasaccharide and saccharide compositions comprising the same can be appropriately concentrated into syrupy products, and optionally they can be further dried into powdery products.
  • cyclotetrasaccharide crystals for example, high cyclotetrasaccharide content solutions, having a concentration of about 30-90% and a purity of about at least 50% of cyclotetrasaccharide, are placed in a crystallizer optionally in the presence of an organic solvent, and then gradually cooled while stirring in the presence of 0.1-20%, d.s.b., of a seed crystal to the cyclotetrasaccharide at temperatures of 95_C or lower, preferably, 10-90_C, to obtain massecuites.
  • the methods to collect cyclotetrasaccharide crystals and molasses with such crystals include, for example, conventional methods such as separation, block pulverization, fluidized granulation, and spray drying methods.
  • the resulting cyclotetrasaccharide according to the present invention is a stable, high-quality, low sweetness, non-reducing white power, and is almost free of browning, smelling, and deterioration of materials even when mixed or processed therewith:
  • the materials are particularly, for example, amino acid-containing substances such as amino acids, oligopeptides, and proteins.
  • cyclotetrasaccharide Since cyclotetrasaccharide has an inclusion ability, it effectively inhibits the dispersion and quality deterioration of flavorful components and effective ingredients, and stably retains them.
  • the combination use of cyclotetrasaccharide and other cyclic saccharide(s) such as cyclodextrins, branched cyclodextrins, cyclodextrans, and cyclofructans can be advantageously used to improve the level of the inclusion ability of cyclotetrasaccharide, if necessary.
  • cyclic saccharides such as cyclodextrins usable in the present invention should not be restricted to those with a high purity, and can be advantageously a relatively-low purity of cyclotetrasaccharide such as partial starch hydrolyzates containing a large quantity of maltodextrins and cyclodextrins.
  • cyclotetrasaccharide is not hydrolyzed by amylase and ⁇ -glucosidase, it is substantially free of assimilation by the body when orally administered.
  • the saccharide is not substantially assimilated by intestinal microorganisms, and therefore it can be used as an extremely-low caloric water-soluble dietary fiber.
  • Cyclotetrasaccharide can be also used as a sweetener substantially free from causing dental caries because it is scarcely assimilated by dental caries-inducing microorganisms. The saccharide prevents the adhesion and solidification of powdery products.
  • cyclotetrasaccharide of the present invention per se is a natural sweetener with a satisfactory stability but with no toxicity, harm, and side effect, and because of these it can be advantageously used for tablets and sugar-coated tablets in combination with binders such as pullulan, hydroxyethyl starch, and polyvinylpyrrolidone. Furthermore, cyclotetrasaccharide has properties of osmosis-controlling ability, filler-imparting ability, gloss-imparting ability, moisture-retaining ability, viscosity, crystallization prevention ability for other saccharides, insubstantial fermentability, etc.
  • the cyclotetrasaccharide and the saccharide compositions comprising the same of the present invention can be arbitrary used as a sweetener, taste-improving agent, quality-improving agent, stabilizer, preventive of discoloration, excipient, etc., in a variety of compositions such as food products, tobaccos, cigarettes, feeds, pet foods, cosmetics, and pharmaceuticals.
  • cyclotetrasaccharide and the saccharide compositions comprising the same of the present invention can be used in combination with one or more other sweeteners, for example, powdered syrup, glucose, isomerized sugar, sucrose, maltose, trehalose, honey, maple sugar, sorbitol, maltitol, dihydrochalcone, stevioside, ⁇ -glycosyl stevioside, sweetener of Momordica grosvenori, glycyrrhizin, thaumatin, L-aspartyl L-phenylalanine methyl ester, saccharin, acesulfame K, sucralose, glycine, and alanine; and fillers such as dextrins, starches, and lactose.
  • sweeteners for example, powdered syrup, glucose, isomerized sugar, sucrose, maltose, trehalose, honey, maple sugar, sorbitol, maltito
  • the cyclotetrasaccharide and the saccharide compositions comprising the same can be suitably used as a low-caloric sweetener, diet sweetener, or the like in combination with one or more low-caloric sweeteners such as meso-erythritol, xylitol, and maltitol; and/or one or more sweeteners with a relatively-high sweetening power such as ⁇ -glycosyl stevioside, thaumatin, L-aspartyl L-phenylalanine methyl ester, saccharin, acesulfame K, and sucralose.
  • one or more low-caloric sweeteners such as meso-erythritol, xylitol, and maltitol
  • one or more sweeteners with a relatively-high sweetening power such as ⁇ -glycosyl stevioside, thaumatin, L-aspartyl L-phenylalan
  • cyclotetrasaccharide and the saccharide compositions comprising the same of the present invention can be arbitrarily used intact or after mixing with fillers, excipients, binders, etc., and then formed into products with different shapes such as granules, spheres, plates, cubes, and tablets.
  • cyclotetrasaccharide and the saccharide compositions comprising the same of the present invention well harmonize with other tastable materials having sour-, acid-, salty-, delicious-, astringent-, and bitter-tastes; and have a satisfactorily high acid- and heat-tolerance.
  • soy sauce powdered soy sauce, miso, "funmatsu-miso” (a powdered miso ), "moromi” (a refined sake), “hishio” (a refined soy sauce), “furikake” (a seasoned fish meal), mayonnaise, dressing, vinegar, " sanbai-zu “ (a sauce of sugar, soy sauce and vinegar), “funmatsu-sushi-su” (powdered vinegar for sushi), “chuka-no-moto” (an instant mix for Chinese dish), “tentsuyu” (a sauce for Japanese deep-fat fried food), “mentsuyu” (a sauce for Japanese vermicelli), sauce, catsup, "yakiniku-no-tare” (a sauce for Japanese grilled meat), curry roux, instant stew mix,
  • the cyclotetrasaccharide and the saccharide compositions comprising the same of the present invention can be arbitrarily used to sweeten and improve the taste and quality of "wagashi” (Japanese cakes) such as “senbei” (a rice cracker), “arare” (a rice cake cube), “okoshi” (a millet-and-rice cake), “gyuhi” (a starch paste), “mochi” (a rice paste) and the like, “manju” (a bun with a bean-jam), “uiro” (a sweet rice jelly), “an” (a bean jam) and the like, “yokan” (a sweet jelly of beans), “mizu-yokan” (a soft adzuki-bean jelly), “kingyoku” (a kind of yokan), jelly, pao de Castella, and “amedama” (a Japanese toffee); Western confectioneries such as a bun, biscuit, cracker, cookie, pie, pudding, butter cream, cu
  • the cyclotetrasaccharide and the saccharide compositions comprising the same of the present invention can be arbitrarily used to prolong or retain the flavor and taste of fresh-baked Japanese and Western confectioneries and to improve the taste preference of feeds and pet foods for animals and pets such as domestic animals, poultry, honey bees, silk warms, and fishes; and also they can be arbitrary used as a sweetener, taste-improving agent, flavoring substance, quality-improving agent, and stabilizer in other products in a paste or liquid form such as a tobacco, cigarette, tooth paste, lipstick, rouge, lip cream, internal liquid medicine, tablet, troche, cod liver oil in the form of drop, cachou, oral refrigerant, gargle, cosmetic, and pharmaceutical.
  • the cyclotetrasaccharide and the saccharide compositions comprising the same of the present invention can be arbitrarily used in biologically active substances susceptible to lose their effective ingredients and activities, as well as in health foods and pharmaceuticals containing the biologically active substances.
  • liquid preparations containing lymphokines such as ⁇ -, ⁇ - and ⁇ -interferons, tumor necrosis factor- ⁇ (TNF- ⁇ ), tumor necrosis factor- ⁇ (TNF- ⁇ ), macrophage migration inhibitory factor, colony-stimulating factor, transfer factor, and interleukin 2; liquid preparations containing hormones such as insulin, growth hormone, prolactin, erythropoietin, and follicle-stimulating hormone; biological preparations such as BCG vaccine, Japanese encephalitis vaccine, measles vaccine, live polio vaccine, smallpox vaccine, tetanus toxoid, Trimeresurus antitoxin, and human immunoglobulin; antibiotics such as penicillin, erythromycin, chloramphenicol, tetracycline, streptomycin, and kanamycin sulfate; liquid preparations containing vitamins such as thiamine, riboflavin, L-ascorbic acid
  • the above biologically active substances and other pastes of living microorganisms such as viruses, lactic acid bacteria, and yeasts can be arbitrary prepared into health foods and pharmaceuticals in a liquid, paste, or solid form, which have a satisfactorily-high stability and quality with less fear of losing or inactivating their effective ingredients and activities.
  • the following effects and features are also effectively exerted when used with other ingredients which are generally used externally:
  • the cyclotetrasaccharide and the saccharide compositions comprising the same of the present invention can be usually used in an appropriate combination with one or more dermatologically applicable other ingredients of oils and lipids, waxes, hydrocarbons, fatty acids, esters, alcohols, surfactants, dyes, flavors, hormones, vitamins, plant extracts, animal extracts, microbial extracts, salts, ultraviolet absorbents, photosensitizing dyes, antioxidants, antiseptics/bactericides, antiperspirants/deodorants, refreshments, chelating agents, skin whitening agents, anti-inflamatories, enzymes, saccharides, amino acids, and thickening agents.
  • one or more dermatologically applicable other ingredients of oils and lipids, waxes, hydrocarbons, fatty acids, esters, alcohols, surfactants, dyes, flavors, hormones, vitamins, plant extracts, animal extracts, microbial extracts, salts, ultraviolet absorbents, photosensitizing dyes, antioxidants, antiseptics
  • the external dermal compositions can be provided in the form of a lotion, cream, milky lotion, gel, powder, paste, or block, for example, cleaning cosmetics such as soaps, cosmetic soaps, washing powders for the skin, face washing creams, facial rinses, body shampoos, body rinses, shampoos, and powders for washing hair; cosmetics for hair such as set lotions, hair blows, stick pomades, hair creams, pomades, hair sprays, hair liquids, hair tonics, hair lotions, hair restorers, hair dyes, treatments for scalp, hair cosmetics, gloss-imparting hair oils, hair oils, and combing oils; base cosmetics such as cosmetic lotions, vanishing creams, emollient creams, emollient lotions, cosmetic packs in the form of a jelly peal off, jelly wiping, paste washing, powders, cleansing creams, cold creams, hand creams, hand lotions, milky lotions, moisture-imparting liquids, after/before shaving
  • cleaning cosmetics such as soaps
  • oils and fats including plant oils in the form of a liquid at ambient temperature such as an avocado oil, almond oil, olive oil, sesame oil, safflower oil, soy bean oil, camellia oil, persic oil, castor oil, and cotton seed oil; plant fats in the form of a solid at ambient temperature such as a cacao fat, palm fat/oil, and vegetable wax; and animal oils such as mink oil, egg yolk oil, and turtle oil.
  • waxes usable in the present invention are plant waxes such as a hohoba oil, carnauba was, and candelilla wax; animal waxes such as a sperm oil, Baird's beaked while oil, beeswax, whale oil, and lanoline; and mineral oils such as a montan wax.
  • the carbohydrates usable in the present invention are, for example, mineral carbohydrates such as a paraffin or solid paraffin, liquid paraffin, ceresin, microcrystalline wax, and petrolatum; and animal hydrocarbons such as squalane and squalene.
  • fatty acids usable in the present invention are lauric acid, myristic acid, palmitic acid, stearic acid, oleic acid, behenic acid, undecylenic acid, lanolin fatty acid, hard lanolin fatty acid, soft lanolin fatty acid, isostearic acid, and derivatives thereof.
  • the alcohols usable in the present invention are, for example, higher alcohols including polyalcohols such as lauryl alcohol, cetanol, setostearyl alcohol, stearyl alcohol, oleyl alcohol, behenyl alcohol, lanoline alcohol, hydrogenated lanoline alcohol, hexyldecanol, octyldodecanol, and polyethylene glycol; lower alcohols including polyalcohols such as ethanol, propanol, isopropanol, butanol, ethylene glycol, propylene glycol, and glycerine; and derivatives thereof.
  • higher alcohols including polyalcohols such as lauryl alcohol, cetanol, setostearyl alcohol, stearyl alcohol, oleyl alcohol, behenyl alcohol, lanoline alcohol, hydrogenated lanoline alcohol, hexyldecanol, octyldodecanol, and polyethylene glycol
  • esters usable in the present invention are hexyl laurate, isopropyl myristate, myristyl myristate, cetyl myristate, octyl dodecyl myristate, isopropyl palmitate, butyl stearate, cholesteryl stearate, cholesteryl acetate, cholesteryl n-lactate, cholesteryl caproate, cholesteryl laurate, cholesteryl myristate, cholesteryl palmitate, cholesteryl stearate, cholesteryl 12-hydroxystearate, decyl oleate, octyldodecyl oleate, isopropyl lanoline fatty acid, glycerine trimyristate, propylene glycol dioleate, myristyl lactate, cetyl lactate, lanoline acetate, hexyldecyl dimethyloct
  • the surfactants usable in the present invention are, for example, anion surfactants such as zinc laurate, zinc myristate, zinc palmitate, magnesium stearate, sodium lauryl sulfate, sodium polyoxyethylene laurylether sulfate, triethanolamine polyoxyethylene laurylether sulfate, polyoxyethylene cetylether phosphate, polyoxyethylene alkylphenylether phosphate, sodium N-lauroyl sarcosinate, coconut fatty acid sarcosinate triethanolamine, coconut fatty acid sodium methyltaurate, and soybean phospholipid; cation surfactants such as stearyltrimethylammonium chloride, distearyldimethylammonium chloride, benzalkonium chloride, cetylpyridinium chloride, alkylisoquinolinium bromide, and dodecyldimethyl 2-phenoxyethylammonium bromide; amphoteric ion surfactants such as sodium ⁇
  • red tar dyes such as amaranth, erythrosine, rose bengal, acid red, lake red C, lithol red, rhodamine, brilliant lake red, eosine YS, violamine R, brilliant fast scarlet, Ponceau R, orange tar dyes such as dibromofluorescein, permanent orange, erythrosine yellow NA, and orange I; yellow tar dyes such as tartrazine, sunset yellow, uranin, benzidine yellow G, naphthol yellow S, and yellow AB; green tar dyes such as fast green FCF, alizarin cyanine green F, light green SF yellow, and naphthol green B; blue tar dyes such as brilliant blue FCF, indigo carmine, indigo, patent blue NA, carbanthrene blue, and sudan blue; brown tar dyes such as resorcin brown; purple tar dyes such as alizarin purple and alizarin purple; black
  • the flavors used generally in external dermal uses can be roughly classified into natural plant and animal flavors, synthetic flavors, and mixtures thereof in an appropriate combination.
  • animal flavors include musk, civetone, and ambergris.
  • the plant flavors are, for example, distillations, i.e., essential oils, obtainable by distilling, for example, with water vapor anise seeds, basil leaves, caraway fruit, cinnamon barks, coriander seeds, lavender flowers, nutmeg seeds, peppermint leaves, rose flowers, rosemary flowers, seeds, and leaves, and thyme leaves; extracts classified generally into absolutes, resinoids, oleo resins, and tinctures depending on properties and processes.
  • Examples of the synthetic flavors are acetophenone, anisole, benzyl alcohol, butyl acetate, camphor, citral, citronellol, cuminaldehyde, estragol, ethylvaniline, geranyl acetate, linarol, menthol, methyl p-cresol, methyl salicylate, phenyl acetate, vanillin, and derivatives thereof.
  • flavor compositions mixed with the aforesaid flavors in an appropriate combination can be arbitrarily used.
  • the hormones usable in the present invention include, for example, follicle hormones such as estrone and estradiol; gestagens such as progesterone and pregnenolone; and adrenal cortex hormones such as cortisone, hydrocortisone, and prednisolone.
  • follicle hormones such as estrone and estradiol
  • gestagens such as progesterone and pregnenolone
  • adrenal cortex hormones such as cortisone, hydrocortisone, and prednisolone.
  • vitamins usable in the present invention are, for example, vitamin A compounds such as retinol, retinoic acid, ⁇ -, ⁇ - and ⁇ -carotenes, and derivatives thereof; vitamin B compounds such as thiamine (vitamin B1), riboflavin (vitamin B2), vitamin B6 including pyridoxine, pyridoxal, and pyridoxamine, and derivatives thereof; vitamin C compounds such as L-ascorbic acid, 2-O- ⁇ -D-glucosyl-L-ascorbic acid, acyl derivatives, alias lipophilic vitamin C, of L-ascorbic acid and glycosyl-L-ascorbic acid, and other L-ascorbic acid derivatives such as L-ascorbic acid sulfate ester; vitamin D compounds such as ergocalciferol, cholecalciferol, and derivatives thereof; and vitamin E compounds such as ⁇ -, ⁇ -, ⁇ - and ⁇ -tocopherol, ⁇ -
  • Examples of the plant extracts usable in the present invention are, in addition to the aforesaid plant extracts used as flavors, extracts such as those of chamomile, sage, aloe, scarlet sage, Angelica keiskei, avocado, nettle, fennel, oolong tea, coak tree bark, barley, Abelmoschus esculentus, allspice, seaweed, chinese quince, licorice, quince seed, gardenia, Sasa albo-marginata, cinnamon, black tea, rice bran, fermented rice bran, Stevia rebaudiana, celery, Japanese green gentian, soy bean, thyme, tea, common camellia, Ligusticum acutilobum, corn, carrot, Rosa rugosa, hinoki (Japanese cypress), dishcloth gourd, safflower, pine, peach, eucalyptus, creeping saxifrage,
  • the salts usable in the external dermal composition of the present invention advantageously include those which can be used generally in conventional external dermal compositions, as well as sea water, deep sea water, dried ingredients of sea water, and natural salts, including those in the form of a liquid, such as mineral salts.
  • the ultraviolet absorbers usable in the present invention include, for example, p-aminobenzoic acid, p-dimethylaminobenzoic acid ethylhexylester, p-methoxycinnamic acid ethylhexylester, 2-(hydroxy-5-methylphenyl)benzotriazole, oxibenzozone, urocanic acid, ethyl urocanate, and derivatives thereof; organic substances capable of shielding ultraviolet rays such as 5-chlorouracil, and guanine cytosine.
  • photosensitive dyes usable in the present invention are 2,2'[3'-[2-(3-heptyl-4-methyl-2-thiazolin-2-ylidene)ethyridene]propenylene]bis[3-heptyl-4-methyl thiazolinium iodide] alias "PLATONIN”, 2-[2-(3-heptyl-4-methyl-2-thiazolin-2-ylidene)methine]-3-heptyl-4-methyl thiazolinium iodide alias "PIONIN”, 6-[2-[(5-bromo-2-pyridyl)amino]vinyl]-1-ethyl-2-picolinium iodide alas "TAKANAL”, 2-(2-anilino vinyl)-3,4-dimethyl-oxazolinium iodide alas "LUMINEX”, and derivatives thereof.
  • the antioxidants usable in the present invention include, for example, propyl gallate, butyl gallate, octyl gallate, dodecyl gallate, nordihydroguaiaretic acid (NDGA), t-butylhydroxyanisole (BHA), butylated hydroxytoluene (BHT), 4-hydroxymethyl-1-2,6-di-t-butylphenol, and derivatives thereof.
  • Examples of the aseptics and bactericides usable in the present invention include, in addition to the aforesaid compounds with aseptic or bactericide activities, phenol compounds such as phenol, p-chloro metacresol, resorcin, p-oxy benzoate, and cresol; acid compounds including those in a salt form such as benzoic acid, sorbic acid, salicylic acid, and boric acid; bisphenol halides such as hexachlorophene, bithionol, and dichlorophene; amides such as 3,4,4'-trichlorocarvaniride, undecylenic acid monoethanolamide; quaternary ammonium compounds such as benzalkonium chloride, benzethonium chloride, and decalinium chloride; chlorhexidine hydrochloride, 1-hydroxypyridine-2-thione, lysozyme chloride; and derivatives thereof.
  • phenol compounds such as phenol, p-chloro metacresol, re
  • the antiperspirants/deodorants usable in the present invention are, for example, aluminum chloride, zinc chloride, chlorohydroxy aluminum, aluminum chlorohydroxy allantoinate, aluminum dihydroxy allantoinate, and aluminum chlorohydrate.
  • Examples of the refreshments usable in the present invention include menthol, mint/peppermint oil, camphor, thymol, spirantol, and methyl salicylic acid.
  • the chelating agents usable in the present invention are, for example, derivatives of ethylenediaminetetraacetic acid, tripolyphosphoric acid, hexamethacrylic acid, dihydroethylglycine, citric acid, tartaric acid, gluconic acid, and sugar acid.
  • the skin whitening agents usable in the present invention are, for example, nucleic acids such as antisense oligonucleotides including antisense oligonucleotides to a tyrosinase gene; kojic acid, lactic acid, anthranilic acid, cumarin, benzotriazole, imidazoline, pyrimidine, dioxane, furan, pyrone, nicotinic acid, arbutin, baicalin, baicalein, and berberine, and derivatives thereof; melanin formation inhibitors, tyrosinase formation inhibitors, and tyrosinase inhibitors.
  • nucleic acids such as antisense oligonucleotides including antisense oligonucleotides to a tyrosinase gene
  • kojic acid lactic acid, anthranilic acid, cumarin, benzotriazole, imidazoline, pyrimidine, dioxane
  • anti-inflammatory agents usable in the present invention include, in addition to the aforesaid those with such anti-inflammatory activity, for example, allantoin, allantoin acetyl-DL-methionine, ⁇ -glycyrrhetinic acid allantoinate, ichthammol, indomethacin, acetylsalicylic acid, diphenhydramine chloride, guaiazulene, camazulene, chlorpheniramine maleate, glycyrrhizinic acid, glycyrrhetinic acid, and oriental gromurel extract.
  • the enzymes usable in the present invention are those from microorganisms of the genera Bacillus and Streptomyces, and yeasts; and those from plants and animals such as protease, lipase, and lysozyme.
  • the saccharides usable in the present invention are, for example, oligosaccharides such as sucrose, maltose, fructose, lactose, and trehalose; cyclic saccharides, excluding cyclotetrasaccharide, such as cyclodextrins; sugar alcohols such as maltitol, sorbitol, mannitol, xylitol, and arabitol; polysaccharides such as hyaluronic acid, chondroitin sulfate, pullulan, cellulose, starch, dextran, pectin, carrageenan, guar gum, corn syrup, gum arabic, tragacanth gum, xanthan gum, and chitin, their derivative and partial hydrolyzates.
  • oligosaccharides such as sucrose, maltose, fructose, lactose, and trehalose
  • cyclic saccharides excluding cyclotetra
  • amino acids usable in the present invention are glycine, serine, threonine, tyrosine, cysteine, cystine, asparagine, glutamine, 2-pyrrolidone-5-carboxylic acid, hydroxyproline, pipecolic acid, sarcosine, homocysteine, homoserine, citrulline, aspartic acid, glutamic acid, cysteine sulfonic acid, argininosuccinic acid, arginine, lysine, histidine, ornithine, alanine, valine, leucine, isoleucine, methionine, phenylalanine, tryptophane, proline, ⁇ -alanine, taurine, ⁇ -aminobutyric acid, ⁇ -aminobutyric acid, and salts thereof.
  • the thickening agents usable in the present invention includes, in addition to the aforesaid compounds having viscosity-imparting ability, for example, water-soluble high molecular substances such as quince seed, sodium alginate, cationated cellulose, hydroxyethyl cellulose, carboxymethyl cellulose, carboxymethyl starch, propylene glycol alginate, collagen, keratin, hydroxypropyl trimethylammonium chloride ether, poly vinyl alcohol, polyvinylpyrrolidone, polyvinylpyrrolidone-vinylacetate copolymer, polyethylene imine, sodium polyacrylate, polyvinylmethyl ether, and carboxyvinylpolymer; electrolytes such as sodium chloride, potassium chloride, and sodium sulfate; and oily materials.
  • water-soluble high molecular substances such as quince seed, sodium alginate, cationated cellulose, hydroxyethyl cellulose, carboxymethyl cellulose, carboxymethyl starch, propy
  • any salt acceptable for external dermal agents other than the above-exemplified salts can be arbitrarily used in the present invention.
  • the methods for incorporating the cyclotetrasaccharide or the saccharide compositions comprising the same according to the present invention into the aforesaid compositions are those which can incorporate the cyclotetrasaccharide and the saccharide compositions into a variety of compositions before completion of their processings, and which can be appropriately selected among the following conventional methods; mixing, kneading, dissolving, melting, soaking, penetrating, dispersing, applying, coating, spraying, injecting, crystallizing, and solidifying.
  • the amount of the cyclotetrasaccharide or the saccharide compositions comprising the same to be preferably incorporated into the final compositions is usually in an amount of at least 0.1%, desirably, at least 1%.
  • TLC silica gel thin-layer chromatography
  • KIESELGEL 60 an aluminum plate (20 x 20 cm) for TLC commercialized by Merck & Co., Inc., Rahway, USA.
  • the coloration of the separated total sugars by the sulfuric acid-methanol method and the reducing saccharides by the diphenylamine-aniline method detected that a non-reducing saccharide was positive on the former detection method but negative on the latter detection method, and had an Rf value of 0.31.
  • HPLC high-performance liquid chromatography
  • FAB-MS Fast atom bombardment mass spectrometry
  • the saccharide was hydrolyzed with sulfuric acid and then analyzed for sugar composition. As a result, only D-glucose was detected, revealing that the saccharide was composed of D-glucose molecules or cyclotetrasaccharide composed of four D-glucose molecules in view of the above mass number.
  • NMR Nuclear magnetic resonance analysis
  • the saccharide of the present invention was a cyclotetrasaccharide as shown in FIG. 4 , i.e., cyclo ⁇ ® 6)- ⁇ -D-glucopyranosyl-(1 ® 3)- ⁇ -D-glucopyranosyl-(1 ® 6)- ⁇ -D-glucopyranosyl-(1 ® 3)- ⁇ -D-glucopyranosyl-(1 ® ⁇ .
  • the resulting culture which had about 0.45 unit/ml of the ⁇ -isomaltosylglucosaccharide-forming enzyme of the present invention, about 1.5 units/ml of ⁇ -isomaltosyl-transferring enzyme, and about 0.95 unit/ml of cyclotetrasaccharide-forming activity, was centrifuged at 10,000 rpm for 30 min to obtain about 18 L of a supernatant.
  • the supernatant When measured for enzymatic activity, the supernatant had about 0.45 unit/ml of the ⁇ -isomaltosylglucosaccharide-forming enzyme of the present invention, i.e., a total enzymatic activity of about 8,110 units; about 1.5 units/ml of ⁇ -isomaltosyl-transferring enzyme, i.e., a total enzymatic activity of about 26,900 units; and about 0.95 unit/ml of cyclotetrasaccharide-forming activity, i.e., a total enzymatic activity of about 17,100 units.
  • the activities of these enzymes were assayed as follows: The ⁇ -isomaltosylglucosaccharide-forming enzyme of the present invention was assayed for enzymatic activity by dissolving maltotriose in 100 mM acetate buffer (pH 6.0) to give a concentration of 2% (w/v) for a substrate solution, adding a 0.5 ml of an enzyme solution to a 0.5 ml of the substrate solution, enzymatically reacting the mixture solution at 35_C for 60 min, suspending the reaction mixture by boiling for 10 min, and quantifying maltose, among the isomaltosyl maltose and maltose formed in the reaction mixture, on HPLC as disclosed in Experiment 1.
  • One unit activity of the ⁇ -isomaltosylglucosaccharide-forming enzyme is defined as the enzyme amount that forms one micromole of maltose per minute under the above enzymatic reaction conditions.
  • the enzymatic activity of the ⁇ -isomaltosylglucosaccharide-forming enzyme means the unit(s) assayed as above.
  • the ⁇ -isomaltosyl-transferring enzyme was assayed for enzymatic activity by dissolving panose in 100 mM acetate buffer (pH 6.0) to give a concentration of 2% (w/v) for a substrate solution, adding a 0.5 ml of an enzyme solution to 0.5 ml of the substrate solution, enzymatically reacting the mixture solution at 35_C for 30 min, suspending the reaction mixture by boiling for 10 min, and quantifying glucose, among the cyclotetrasaccharide and glucose formed in the reaction mixture, by the glucose oxidase method.
  • One unit activity of the ⁇ -isomaltosyl-transferring enzyme is defined as the enzyme amount that forms one micromole of glucose per minute under the above enzymatic reaction conditions.
  • the enzymatic activity of the ⁇ -isomaltosyl-transferring enzyme means the unit(s) assayed as above.
  • the cyclotetrasaccharide-forming activity is assayed by dissolving "PINE-DEX #100", a partial starch hydrolysate commercialized by Matsutani Chemical Ind., Tokyo, Japan, in 50 mM acetate buffer (pH 6.0) to give a concentration of 2% (w/v) for a substrate solution, adding 0.5 ml of an enzyme solution to 0.5 ml of the substrate solution, enzymatically reacting the mixture solution at 35_C for 60 min, suspending the reaction mixture by boiling for 10 min, and then further adding to the resulting mixture one milliliter of 50 mM acetate buffer (pH 5.0) with 70 units/ml of "TRANSGLUCOSIDASE L AMANO TM ", an ⁇ -glucosidase commercialized by Amano Pharmaceutical Co., Ltd., Aichi, Japan, and 27 units/ml of glucoamylase, commercialized by Nagase Biochemicals, Ltd., Kyoto, Japan, and
  • One unit of cyclotetrasaccharide-forming activity is defined as the enzyme amount that forms one micromole of cyclotetrasaccharide per minute under the above enzymatic reaction conditions.
  • the cyclotetrasaccharide-forming activity means the activity (units) assayed as above.
  • the crude enzyme solution was subjected to ion-exchange chromatography using 1,000 ml of "SEPABEADS FP-DA13" gel, an ion-exchange resin commercialized by Mitsubishi Chemical Industries, Ltd., Tokyo, Japan.
  • the ⁇ -isomaltosylglucosaccharide-forming enzyme and cyclotetrasaccharide were eluted as non-adsorbed fractions without adsorbing on the ion-exchange resin.
  • the resulting enzyme solution was dialyzed against 10 mM phosphate buffer (pH 7.0) with 1 M ammonium sulfate, and the dialyzed solution was centrifuged to remove impurities, and subjected to affinity chromatography using 500 ml of "SEPHACRYL HR S-200", a gel commercialized by Amersham Corp., Div. Amersham International, Arlington Heights, IL, USA.
  • fractions with ⁇ -isomaltosyl-transferring activity and those with the ⁇ -isomaltosylglucosaccharide-forming activity according to the present invention were separatory collected.
  • No cyclotetrasaccharide-forming activity was found in any of the above fractions and this revealed that a mixture solution of the above fractions with ⁇ -isomaltosylglucosaccharide-forming enzyme and ⁇ -isomaltosyl-transferring enzyme had also cyclotetrasaccharide-forming activity, and revealed that the activity of forming cyclotetrasaccharide from partial starch hydrolyzates was exerted by the coaction of the activities of the above two types of enzymes.
  • the enzyme was adsorbed on the gel and eluted at about 0.3 M ammonium sulfate when eluted with a linear gradient decreasing from 1 M to 0 M of ammonium sulfate, followed by collecting fractions with the enzyme activity.
  • the fractions were pooled and again dialyzed against 10 mM phosphate buffer (pH 7.0) containing 1 M ammonium sulfate.
  • the resulting dialyzed solution was centrifuged to remove impurities and fed to affinity chromatography using "SEPHACRYL HR S-200" gel to purify the enzyme.
  • the amount of enzyme activity, specific activity, and yield of the ⁇ -isomaltosylglucosaccharide-forming enzyme in each purification step are in Table 1.
  • the finally purified ⁇ -isomaltosylglucosaccharide-forming enzyme specimen was assayed for purity on gel electrophoresis using a 7.5% (w/v) polyacrylamide gel and detected on the gel as a single protein band, i.e., a high purity enzyme specimen.
  • a fresh preparation of the above purified specimen was subjected to isoelectrophoresis using a gel containing 2% (w/v) ampholine commercialized by Amersham Corp., Div. Amersham International, Arlington Heights, IL, USA, and then measured for pHs of protein bands and gel to determine the isoelectric point of the enzyme, revealing that the enzyme had an isoelectric point of about 5.2 ⁇ 0.5.
  • the influence of temperature and pH on the activity of ⁇ -isomaltosylglucosaccharide-forming enzyme was examined in accordance with the assay for the enzyme activity, where the influence of temperature was conducted in the presence or absence of 1 mM Ca 2+ . These results are in FIG. 5 (influence of temperature) and FIG. 6 (influence of pH).
  • the optimum temperature of the enzyme was about 40_C (in the absence of Ca 2+ ) and about 45_C (in the presence of 1 mM Ca 2+ ) when incubated at pH 6.0 for 60 min, and the optimum pH of the enzyme was about 6.0 to about 6.5 when incubated at 35_C for 60 min.
  • the thermal stability of the enzyme was determined by incubating the testing enzyme solutions in 20 mM acetate buffer (pH 6.0) at prescribed temperatures for 60 min in the presence or absence of 1 mM Ca 2+ , cooling with water the resulting enzyme solutions, and assaying the remaining enzyme activity of each solution.
  • the pH stability of the enzymes was determined by keeping the testing enzyme solutions in 50 mM buffers having prescribed pHs at 4_C for 24 hours, adjusting the pH of each solution to 6.0, and assaying the remaining enzyme activity of each solution. These results are respectively in FIG. 7 (thermal stability) and FIG. 8 (pH stability). As a result, the enzyme had thermal stability of up to about 35_C in the absence of Ca 2+ and about 40_C in the presence of 1 mM Ca 2+ , and pH stability of about 4.5 to about 9.0.
  • a fresh preparation of the above purified specimen was subjected to isoelectrophoresis using a gel containing 2% (w/v) ampholine commercialized by Amersham Corp., Div. Amersham International, Arlington Heights, IL, USA, and then measured for pHs of protein bands and gel to determine the isoelectric point of the enzyme, revealing that the enzyme had an isoelectric point of about 5.5 ⁇ 0.5.
  • the influence of temperature and pH on the activity of ⁇ -isomaltosyl-transferring enzyme was examined in accordance with the assay for the enzyme activity. These results are in FIG. 9 (influence of temperature) and FIG. 10 (influence of pH).
  • the optimum temperature of the enzyme was about 45_C when incubated at pH 6.0 for 30 min, and the optimum pH of the enzyme was about 6.0 when incubated at 35_C for 30 min.
  • the thermal stability of the enzyme was determined by incubating the testing enzyme solutions in 20 mM acetate buffer (pH 6.0) at prescribed temperatures for 60 min, cooling with water the resulting enzyme solutions, and assaying the remaining enzyme activity of each solution.
  • the pH stability of the enzyme was determined by keeping the testing enzyme solutions in 50 mM buffers having prescribed pHs at 4_C for 24 hours, adjusting the pH of each solution to 6.0, and assaying the remaining enzyme activity of each solution. These results are respectively in FIG. 11 (thermal stability) and FIG. 12 (pH stability). As a result, the enzyme had thermal stability of up to about 40_C and pH stability of about 4.0 to about 9.0.
  • a liquid nutrient culture medium consisting of 4.0% (w/v) of "PINE-DEX #100", a partial starch hydrolysate, 1.8% (w/v) of "ASAHIMEAST", a yeast extract, 0.1% (w/v) of dipotassium phosphate, 0.06% (w/v) of sodium phosphate dodecahydrate, 0.05% (w/v) magnesium sulfate heptahydrate, and water was placed in 500-ml Erlenmeyer flasks in a volume of 100 ml each, autoclaved at 121_C for 20 minutes to effect sterilization, cooled, inoculated with a stock culture of Bacillus globisporus C11, FERM BP-7144, and incubated at 27_C for 48 hours under rotary shaking conditions of 230 rpm. The resulting cultures were pooled and used as a seed culture.
  • the resultant culture having about 0.55 unit/ml of ⁇ -isomaltosylglucosaccharide-forming enzyme activity, about 1.8 units/ml of ⁇ -isomaltosyl-transferring enzyme activity, and about 1.1 units/ml of cyclotetrasaccharide-forming enzyme activity, was centrifuged at 10,000 rpm for 30 min to obtain about 18 L of a supernatant.
  • Measurement of the supernatant revealed that it had about 0.51 unit/ml of ⁇ -isomaltosylglucosaccharide-forming enzyme activity, i.e., a total enzyme activity of about 9,180 units; about 1.7 units/ml of ⁇ -isomaltosyl-transferring enzyme activity, i.e., a total enzyme activity of about 30,400 units; and about 1.1 units/ml of cyclotetrasaccharide-forming enzyme activity, i.e., a total enzyme activity of about 19,400 units.
  • Active enzymes was adsorbed on the gel and sequentially was eluted with a linear gradient decreasing from 1 M to O M of ammonium sulfate and a linear gradient increasing from 0 mM to 100 mM of maltotetraose, followed by separate elution of ⁇ -isomaltosyl-transferring enzyme and the ⁇ -isomaltosylglucosaccharide-forming enzyme, where the former enzyme was eluted with the linear gradient of ammonium sulfate at a concentration of about 0.3 M and the latter enzyme was eluted with a linear gradient of maltotetraose at a concentration of about 30 mM.
  • a faction of the ⁇ -isomaltosylglucosaccharide-forming enzyme of the present invention was dialyzed against 10 mM phosphate buffer (pH 7.0) containing 1 M ammonium sulfate.
  • the dialyzed solution was centrifuged to remove insoluble impurities, and the resulting supernatant was fed to hydrophobic chromatography using 350 ml of "BUTYL-TOYOPEARL 650 M", a gel commercialized by Tosoh Corporation, Tokyo, Japan.
  • the enzyme adsorbed on the gel was eluted at about 0.3 M ammonium sulfate when eluted with a linear gradient decreasing from 1 M to 0 M of ammonium sulfate, followed by collecting fractions with the enzyme activity.
  • the fractions were pooled and dialyzed against 10 mM phosphate buffer (pH 7.0) containing 1 M ammonium sulfate.
  • the resulting dialyzed solution was centrifuged to remove impurities and fed to affinity chromatography using "SEPHACRYL HR S-200" gel to purify the enzyme.
  • the amount of enzyme activity, specific activity, and yield of the ⁇ -isomaltosylglucosaccharide-forming enzyme in each purification step are in Table 5.
  • the finally purified ⁇ -isomaltosylglucosaccharide-forming enzyme specimen was assayed for purity on gel electrophoresis using a 7.5% (w/v) polyacrylamide gel and detected on the gel as a single protein band, meaning a high purity enzyme specimen.
  • the fractions were pooled and dialyzed against 10 mM phosphate buffer (pH 7.0) containing 1 M ammonium sulfate.
  • the resulting dialyzed solution was centrifuged to remove impurities and fed to affinity chromatography using "SEPHACRYL HR S-200" gel to purify the enzyme.
  • the amount of enzyme activity, specific activity, and yield of the ⁇ -isomaltosyl-transferring enzyme in each purification step are in Table 6.
  • a fresh preparation of the above purified specimen was subjected to isoelectrophoresis using a gel containing 2% (w/v) ampholine commercialized by Amersham Corp., Div. Amersham International, Arlington Heights, IL, USA, and then measured for pHs of protein bands and gel to determine the isoelectric point of the enzyme, revealing that the enzyme had an isoelectric point of about 5.2 ⁇ 0.5.
  • the influence of temperature and pH on the activity of ⁇ -isomaltosylglucosaccharide-forming enzyme was examined in accordance with the assay for the enzyme activity, where the influence of temperature was conducted in the presence or absence of 1 mM Ca 2+ . These results are in FIG. 13 (influence of temperature) and FIG. 14 (influence of pH).
  • the optimum temperature of the enzyme was about 45_C in the absence of Ca 2+ and about 50_C in the presence of 1 mM Ca 2+ when incubated at pH 6.0 for 60 min.
  • the optimum pH of the enzyme was about 6.0 when incubated at 35_C for 60 min.
  • the thermal stability of the enzyme was determined by incubating the testing enzyme solutions in 20 mM acetate buffer (pH 6.0) in the presence or absence of 1 mM Ca 2+ at prescribed temperatures for 60 min, cooling with water the resulting enzyme solutions, and assaying the remaining enzyme activity of each solution.
  • the pH stability of the enzyme was determined by keeping the testing enzyme solutions in 50 mM buffers having prescribed pHs at 4_C for 24 hours, adjusting the pH of each solution to 6.0, and assaying the remaining enzyme activity of each solution. These results are respectively in FIG. 15 (thermal stability) and FIG. 16 (pH stability). As a result, the enzyme had thermal stability of up to about 40_C in the absence of Ca 2+ and up to about 45_C in the presence of 1 mM Ca 2+ .
  • the pH stability of enzyme was about 5.0 to about 10.0.
  • a fresh preparation of the above purified specimen was subjected to isoelectrophoresis using a gel containing 2% (w/v) ampholine commercialized by Amersham Corp., Div. Amersham International, Arlington Heights, IL, USA, and then measured for pHs of protein bands and gel to determine the isoelectric point of the enzyme, revealing that the enzyme had an isoelectric point of about 5.6 ⁇ 0.5.
  • the influence of temperature and pH on the activity of ⁇ -isomaltosyl-transferring enzyme was examined in accordance with the assay for the enzyme activity. These results are in FIG. 17 (influence of temperature) and FIG. 18 (influence of pH).
  • the optimum temperature of the enzyme was about 50_C when incubated at pH 6.0 for 30 min.
  • the optimum pH of the enzyme was about 5.5 to about 6.0 when incubated at 35_C for 30 min.
  • the thermal stability of the enzyme was determined by incubating the testing enzyme solutions in 20 mM acetate buffer (pH 6.0) at prescribed temperatures for 60 min, cooling with water the resulting enzyme solutions, and assaying the remaining enzyme activity of each solution.
  • the pH stability of the enzyme was determined by keeping the testing enzyme solutions in 50 mM buffers having prescribed pHs at 4_C for 24 hours, adjusting the pH of each solution to 6.0, and assaying the remaining enzyme activity of each solution. These results are respectively in FIG. 19 (thermal stability) and FIG. 20 (pH stability). As a result, the enzyme had thermal stability of up to about 40_C and pH stability of about 4.5 to about 9.0.
  • One milliliter of the dilute as a test sample was admixed with 10 ⁇ g of trypsin commercialized by Wako Pure Chemical Industries, Ltd., Tokyo, Japan, and incubated at 30_C for 22 hours to hydrolyze into peptides.
  • the resulting hydrolyzates were subjected to reverse-phase HPLC using " ⁇ -Bondapak C18 column" with a diameter of 2.1 mm and a length of 150 mm, a product of Waters Chromatography Div., MILLIPORE Corp., Milford, USA, at a flow rate of 0.9 ml/min and at ambient temperature, and using a liner gradient of acetonitrile increasing from 80 (v/v) to 400 (v/v) in 0.1% (v/v) trifluoroacetate over 120 min.
  • the peptides eluted from the column were detected by monitoring the absorbency at a wavelength of 210 nm.
  • peptide specimens named P64 with a retention time of about 64 min, P88 with a retention time of about 88 min, and P99 with a retention time of about 99 min, which had been well separated from other peptides, were separately collected and dried in vacuo and then dissolved in 200 ⁇ l of a solution of 0.1% (v/v) trifluoroacetate and 50% (v/v) acetonitrile.
  • Each peptide specimen was subjected to a protein sequencer for analyzing amino acid sequence up to eight amino acid residues to obtain amino acid sequences of SEQ ID NOs:5 to 7.
  • the analyzed internal partial amino acid sequences are in Table 9.
  • One milliliter of the dilute as a test sample was admixed with 10 ⁇ g of "Lysyl Endopeptidase" commercialized by Wako Pure Chemical Industries, Ltd., Tokyo, Japan, and allowed to react at 30_C for 22 hours to form peptides.
  • the resultant mixtures were subjected to reverse-phase HPLC to separate the peptides using " ⁇ -Bondapak C18 column" having a diameter of 2.1 mm and a length of 150 mm, a product of Waters Chromatography Div., MILLIPORE Corp., Milford, USA, at a flow rate of 0.9 ml/min and at ambient temperature, and using a liner gradient of acetonitrile increasing from 8% (v/v) to 40% (v/v) in 0.1% (v/v) trifluoroacetate over 120 min.
  • the peptides eluted from the column were detected by monitoring the absorbency at a wavelength of 210 nm.
  • peptide specimens named P22 with a retention time of about 22 min, P63 with a retention time of about 63 min, and P71 with a retention time of about 71 min, which had been well separated from other peptides, were separately collected and dried in vacuo and then dissolved in 200 ⁇ l of a solution of 0.1% (v/v) trifluoroacetate and 50% (v/v) acetonitrile.
  • Each peptide specimen was subjected to a protein sequencer for analyzing amino acid sequence up to eight amino acid residues to obtain amino acid sequences of SEQ ID NOs:8 to 10.
  • the analyzed internal partial amino acid sequences are in Table 10.
  • a liquid nutrient culture medium consisting of 4.0% (w/v) of "PINE-DEX #4", a partial starch hydrolysate, 1.8% (w/v) of "ASAHIMEAST", a yeast extract, 0.1% (w/v) of dipotassium phosphate, 0.06% (w/v) of sodium phosphate dodecahydrate, 0.05% (w/v) magnesium sulfate heptahydrate, and water was placed in 500-ml Erlenmeyer flasks in a volume of 100 ml each, autoclaved at 121_C for 20 minutes to effect sterilization, cooled, inoculated with a stock culture of Bacillus globisporus N75, FERM BP-7591, and incubated at 27_C for 48 hours under rotary shaking conditions of 230 rpm for use as a seed culture.
  • the resultant culture having about 0.34 unit/ml of ⁇ -isomaltosylglucosaccharide-forming enzyme activity, about 1.1 units/ml of ⁇ -isomaltosyl-transferring enzyme activity, and about 0.69 unit/ml of cyclotetrasaccharide-forming enzyme activity, was centrifuged at 10,000 rpm for 30 min to obtain about 18 L of a supernatant.
  • Measurement of the supernatant revealed that it had about 0.33 unit/ml of ⁇ -isomaltosylglucosaccharide-forming enzyme activity, i.e., a total enzyme activity of about 5,940 units; about 1.1 units/ml of ⁇ -isomaltosyl-transferring enzyme activity, i.e., a total enzyme activity of about 19,800 units; and about 0.67 unit/ml of cyclotetrasaccharide-forming enzyme activity, i.e., a total enzyme activity of about 12,100 units.
  • the crude enzyme solution was revealed to have 4,710 units of the ⁇ -isomaltosylglucosaccharide-forming enzyme, about 15,700 units of ⁇ -isomaltosyl-transferring enzyme, and about 9,590 units of cyclotetrasaccharide-forming enzyme, followed by subjecting it to ion-exchange chromatography using "SEPABEADS FP-DA13" gel, disclosed in Experiment 4-1.
  • the enzyme was adsorbed on the gel, while ⁇ -isomaltosyl-transferring enzyme was eluted as a non-adsorbed fraction without adsorption on the gel.
  • the ⁇ -isomaltosylglucosaccharide-forming enzyme of the present invention When eluted with a linear gradient increasing from 0 M to 1 M NaCl, the ⁇ -isomaltosylglucosaccharide-forming enzyme of the present invention was eluted at a concentration of about 0.25 M NaCl. Under these conditions, fractions with the ⁇ -isomaltosylglucosaccharide-forming enzyme activity of the present invention and those with ⁇ -isomaltosyl-transferring enzyme were separately fractionated and collected.
  • the above fractions with the ⁇ -isomaltosylglucosaccharide-forming enzyme of the present invention were pooled and then dialyzed against 10 mM phosphate buffer (pH 7.0) containing 1 M ammonium sulfate, and the dialyzed solution was centrifuged to remove impurities and fed to affinity chromatography using 500 ml of "SEPHACRYL HR S-200" gel.
  • the enzyme was adsorbed on the gel and then eluted therefrom sequentially with a linear gradient decreasing from 1 M to 0 M ammonium sulfate and with a linear gradient increasing from 0 mM to 100 mM maltotetraose.
  • the ⁇ -isomaltosylglucosaccharide-forming enzyme adsorbed on the gel was eluted therefrom at a concentration of about 30 mM maltotetraose, followed by collecting fractions with the enzyme activity.
  • the fractions were pooled and dialyzed against 10 mM phosphate buffer (pH 7.0) containing 1 M ammonium sulfate, and the dialyzed solution was centrifuged to remove impurities.
  • the resulting supernatant was fed to hydrophobic chromatography using 350 ml of "BUTYL-TOYOPEARL 650M", a gel commercialized by Tosoh Corporation, Tokyo, Japan.
  • the enzyme was adsorbed on the gel and then eluted with a linear gradient decreasing from 1 M to 0 M ammonium sulfate, resulting in an elution of the enzyme from the gel at a concentration of about 0.3 M ammonium sulfate and collecting fractions with the enzyme activity.
  • the fractions were pooled and dialyzed against 10 mM phosphate buffer (pH 7.0) containing 1 M ammonium sulfate, and the dialyzed solution was centrifuged to remove impurities and purified on affinity chromatography using 350 ml of "SEPHACRYL HR S-200" gel.
  • the amount of enzyme activity, specific activity, and yield of the ⁇ -isomaltosylglucosaccharide-forming enzyme in each purification step are in Table 11.
  • Table 11 Purification step Enzyme* activity (unit) Specific activity of enzyme* (unit/mg protein) Yield (%) Culture supernatant 5,940 0.10 100 Dialyzed solution after salting out with ammonium sulfate 4,710 0.19 79.3 Eluate from ion-exchange column chromatography 3,200 2.12 53.9 Eluate from affinity column chromatography 2,210 7.55 37.2 Eluate from hydrophobic column chromatography 1,720 10.1 29.0 Eluate from affinity column chromatography 1,320 12.5 22.2 Note : The symbol "*" means ⁇ -isomaltosylglucosaccharide-forming enzyme.
  • the final purified ⁇ -isomaltosylglucosaccharide-forming enzyme specimen was assayed for purity on gel electrophoresis using a 7.5% (w/v) polyacrylamide gel and detected on the gel as a single protein band, meaning a high purity enzyme specimen.
  • the enzyme was adsorbed on the gel and then eluted with a linear gradient decreasing from 1 M to O M of ammonium sulfate, resulting in an elution of the enzyme from the gel at a concentration of about 0.3 M ammonium sulfate and collecting fractions with the enzyme activity.
  • the fractions were pooled and dialyzed against 10 mM phosphate buffer (pH 7.0) containing 1 M ammonium sulfate, and the dialyzed solution was centrifuged to remove impurities and purified on hydrophobic chromatography using 380 ml of "BUTYL-TOYOPEARL 650M" gel.
  • the enzyme was adsorbed on the gel and then eluted therefrom with a linear gradient decreasing from 1 M to 0 M ammonium sulfate, resulting in an elution of the enzyme at a concentration of about 0.3 M ammonium sulfate.
  • the fractions with the enzyme activity were pooled and dialyzed against 10 mM Tris-HCl buffer (pH 8.0), and the dialyzed solution was centrifuged to remove impurities. The resulting supernatant was fed to ion-exchange column chromatography using 380 ml of "SUPER Q-TOYOPEARL 650C" gel commercialized by Tosoh Corporation, Tokyo, Japan.
  • the enzyme was not adsorbed on the gel and then eluted as non-adsorbed fractions which were then collected and pooled to obtain a final purified enzyme preparation.
  • the amount of enzyme activity, specific activity, and yield of the ⁇ -isomaltosylglucosaccharide-forming enzyme in each purification step are in Table 12.
  • the final purified ⁇ -isomaltosyl-transferring enzyme specimen was assayed for purity on gel electrophoresis using a 7.5% (w/v) polyacrylamide gel and detected on the gel as a single protein band, meaning a high purity enzyme specimen.
  • a fresh preparation of the above purified specimen was subjected to isoelectrophoresis using a gel containing 2% (w/v) ampholine commercialized by Amersham Corp., Div. Amersham International, Arlington Heights, IL, USA, and then measured for pHs of protein bands and gel to determine the isoelectric point of the enzyme, revealing that the enzyme had an isoelectric point of about 7.3 ⁇ 0.5.
  • the influence of temperature and pH on the activity of ⁇ -isomaltosylglucosaccharide-forming enzyme was examined in accordance with the assay for the enzyme activity, where the influence of temperature was conducted in the presence or absence of 1 mM Ca 2+ . These results are in FIG. 21 (influence of temperature) and FIG. 22 (influence of pH).
  • the optimum temperature of the enzyme was about 50_C and about 55_C when incubated at pH 6.0 for 60 min in the absence of and in the presence of 1 mM Ca 2+ , respectively.
  • the optimum pH of the enzyme was about 6.0 when incubated at 35_C for 60 min.
  • the thermal stability of the enzyme was determined by incubating the testing enzyme solutions in 20 mM acetate buffer (pH 6.0) at prescribed temperatures for 60 min in the absence of and in the presence of 1 mM Ca 2+ , cooling with water the resulting enzyme solutions, and assaying the remaining enzyme activity of each solution.
  • the pH stability of the enzyme was determined by keeping the testing enzyme solutions in 50 mM buffers having prescribed pHs at 4_C for 24 hours, adjusting the pH of each solution to 6.0, and assaying the remaining enzyme activity of each solution.
  • a fresh preparation of the above purified specimen was subjected to isoelectrophoresis using a gel containing 2% (w/v) ampholine commercialized by Amersham Corp., Div. Amersham International, Arlington Heights, IL, USA, and then measured for pHs of protein bands and gel to determine the isoelectric point of the enzyme, revealing that the enzyme had an isoelectric point of about 7.8 ⁇ 0.5.
  • the influence of temperature and pH on the activity of ⁇ -isomaltosyl-transferring enzyme was examined in accordance with the assay for the enzyme activity. These results are in FIG. 25 (influence of temperature) and FIG. 26 (influence of pH).
  • the optimum temperature of the enzyme was about 50_C.
  • the optimum pH of the enzyme was about 6.0 when incubated at 35_C for 30 min.
  • the thermal stability of the enzyme was determined by incubating the testing enzyme solutions in 20 mM acetate buffer (pH 6.0) at prescribed temperatures for 60 min, cooling with water the resulting enzyme solutions, and assaying the remaining enzyme activity of each solution.
  • the pH stability of the enzyme was determined by keeping the testing enzyme solutions in 50 mM buffers having prescribed pHs at 4_C for 24 hours, adjusting the pH of each solution to 6.0, and assaying the remaining enzyme activity of each solution. These results are respectively in FIG. 27 (thermal stability) and FIG. 28 (pH stability). As a result, the enzyme had thermal stability of up to about 45_C and had pH stability of about 4.5 to about 10.0.
  • One milliliter of the dilute as a test sample was admixed with 20 ⁇ g of "Lysyl Endopeptidase" commercialized by Wako Pure Chemical Industries, Ltd., Tokyo, Japan, and allowed to react at 30_C for 24 hours to form peptides.
  • the resultant mixtures were subjected to reverse-phase HPLC to separate the peptides using " ⁇ -Bondasphere C18 column" having a diameter of 3.9 mm and a length of 150 mm, a product of Waters Chromatography Div., MILLIPORE Corp., Milford, USA, at a flow rate of 0.9 ml/min and at ambient temperature, and using a liner gradient of acetonitrile increasing from 8% (v/v) to 36% (v/v) in 0.1% (v/v) trifluoroacetate over 120 min.
  • the peptides eluted from the column were detected by monitoring the absorbency at a wavelength of 210 nm.
  • PN59 with a retention time of about 59 min
  • PN67 with a retention time of about 67 min
  • PN87 with a retention time of about 87 min, which had been well separated from other peptides, were separately collected and dried in vacuo and then dissolved in 200 ⁇ l of a solution of 0.1% (v/v) trifluoroacetate and 50% (v/v) acetonitrile.
  • Each peptide specimen was subjected to a protein sequencer for analyzing amino acid sequence up to eight amino acid residues to obtain amino acid sequences of SEQ ID NOs:12 to 14.
  • the analyzed internal partial amino acid sequences are in Table 15.
  • Table 15 Peptide name Internal partial amino acid sequence PN59 valine aspartic acid-phenylalanine-serine-asparagine-asparagine-proline-threonine- PN67 tyrosine-threonine-valine-asparagine-alanine-proline-alanine-alanine PN87 tyrosine-glutamic acid-alanine-glutamic acid-serine-alanine-glutamic acid-leucine
  • One milliliter of the dilute as a test sample was admixed with 20 ⁇ g of "Lysyl Endopeptidase" commercialized by Wako Pure Chemical Industries, Ltd., Tokyo, Japan, and allowed to react at 30_C for 24 hours to form peptides.
  • the resultant mixtures were subjected to reverse-phase HPLC to separate the peptides using " ⁇ -Bondasphere C18 column" having a diameter of 3.9 mm and a length of 150 mm, a product of Waters Chromatography Div., MILLIPORE Corp., Milford, USA, at a flow rate of 0.9 ml/min and at ambient temperature, and using a liner gradient of acetonitrile increasing from 4% (v/v) to 42.4% (v/v) in 0.1% (v/v) trifluoroacetate over 90 min.
  • the peptides eluted from the column were detected by monitoring the absorbency at a wavelength of 210 nm.
  • PN21 Three peptide specimens named PN21 with a retention time of about 21 min, PN38 with a retention time of about 38 min, and PN69 with a retention time of about 69 min, which had been well separated from other peptides, were separately collected and dried in vacuo and then dissolved in 200 ⁇ l of a solution of 0.1% (v/v) trifluoroacetate and 50% (v/v) acetonitrile.
  • Each peptide specimen was subjected to a protein sequencer for analyzing amino acid sequence up to eight amino acid residues, but up to six amino acids residues for PN21, to obtain amino acid sequences of SEQ ID NOs: 15 to 17.
  • the analyzed internal partial amino acid sequences are in Table 16.
  • Table 16 Peptide name Internal partial amino acid sequence PN21 asparagine-tryptophane-tryptophane-methionine-serine-lysine PN38 threonine-aspartic acid-glycine-glycine-glutamic acid-methionine-valine-tryptophane PN69 asparagine-isoleucine-tyrosine-leucine-proline-glutamine-glycine-aspartic acid
  • a liquid nutrient culture medium consisting of 4.0% (w/v) of "PINE-DEX #4", a partial starch hydrolysate, 1.8% (w/v) of "ASAHIMEAST", a yeast extract, 0.1% (w/v) of dipotassium phosphate, 0.06% (w/v) of sodium phosphate dodecahydrate, 0.05% (w/v) magnesium sulfate heptahydrate, and water was placed in 500-ml Erlenmeyer flasks in a volume of 100 ml each, autoclaved at 121_C for 20 minutes to effect sterilization, cooled, inoculated with a stock culture of Arthrobacter globiformis A19, FERM BP-7590, and incubated at 27_C for 48 hours under rotary shaking conditions of 230 rpm for use as a seed culture.
  • the resultant culture having about 1.1 units/ml of ⁇ -isomaltosylglucosaccharide-forming enzyme activity, about 1.7 units/ml of ⁇ -isomaltosyl-transferring enzyme activity, and about 0.35 unit/ml of cyclotetrasaccharide-forming enzyme activity, was centrifuged at 10,000 rpm for 30 min to obtain about 18 L of a supernatant.
  • Measurement of the supernatant revealed that it had about 1.06 units/ml of ⁇ -isomaltosylglucosaccharide-forming enzyme activity, i.e., a total enzyme activity of about 19,100 units; about 1.6 units/ml of ⁇ -isomaltosyl-transferring enzyme activity, i.e., a total enzyme activity of about 28,800 units; and about 0.27 unit/ml of cyclotetrasaccharide-forming enzyme activity, i.e., a total enzyme activity of about 4,860 units.
  • the activity of the ⁇ -isomaltosylglucosaccharide-forming enzyme from Arthrobacter globiformis A19 was similarly assayed as the method in Experiment 3 except for using 100 mM glycine-NaOH buffer (pH 8.4) was used as a buffer for substrate.
  • the crude enzyme solution was revealed to have 8,210 units of the ⁇ -isomaltosylglucosaccharide-forming enzyme, about 15,700 units of ⁇ -isomaltosyl-transferring enzyme, and about 20,090 units of cyclotetrasaccharide-forming enzyme, followed by subjecting it to ion-exchange chromatography using 380 ml of "DEAE-TOYOPEARL 650S" gel.
  • the ⁇ -isomaltosylglucosaccharide-forming enzyme adsorbed on the gel was eluted therefrom at a concentration of about 0.2 M ammonium sulfate, followed by collecting fractions with the enzyme activity and pooling them for use as a final purified specimen.
  • the amount of enzyme activity, specific activity, and yield of the ⁇ -isomaltosylglucosaccharide-forming enzyme in each purification step are in Table 17.
  • the final purified ⁇ -isomaltosylglucosaccharide-forming enzyme specimen was assayed for purity on gel electrophoresis using a 7.5% (w/v) polyacrylamide gel and detected on the gel as a single protein band, i.e., a high purity enzyme specimen.
  • the enzyme was adsorbed on the gel and then eluted with a linear gradient decreasing from 1 M to O M of ammonium sulfate, resulting in an elution of the enzyme from the gel at a concentration of about 0 M ammonium sulfate and collecting fractions with the enzyme activity for a partially purified specimen.
  • the amount of enzyme activity, specific activity, and yield of the ⁇ -isomaltosyl-transferring enzyme in each purification step are in Table 18.
  • the partially-purified ⁇ -isomaltosyl-transferring enzyme specimen was assayed for purity on gel electrophoresis using a 7.5% (w/v) polyacrylamide gel and detected on the gel as a main protein band along with three minor protein bands.
  • a fresh preparation of the above purified specimen was subjected to isoelectrophoresis using a gel containing 2% (w/v) ampholine commercialized by Amersham Corp., Div. Amersham International, Arlington Heights, IL, USA, and then measured for pHs of protein bands and gel to determine the isoelectric point of the enzyme, revealing that the enzyme had an isoelectric point of about 4.3 ⁇ 0.5.
  • the influence of temperature and pH on the activity of ⁇ -isomaltosylglucosaccharide-forming enzyme was examined in accordance with the assay for the enzyme activity.
  • the influence of temperature was determined in the presence of or in the absence of 1 mM Ca 2+ . These results are in FIG. 29 (influence of temperature) and FIG. 30 (influence of pH).
  • the optimum temperature of the enzyme was about 60_C and about 65_C in the absence of and in the presence of 1 mM Ca 2+ , respectively.
  • the optimum pH of the enzyme was about 8.4 when incubated at 35_C for 60 min.
  • the thermal stability of the enzyme was determined by incubating the testing enzyme solutions at prescribed temperatures for 60 min in 20 mM glycine-NaOH buffer (pH 8.0) and in the absence of or in the presence of 1 mM Ca 2+ , cooling with water the resulting enzyme solutions, and assaying the remaining enzyme activity of each solution.
  • the pH stability of the enzyme was determined by keeping the testing enzyme solutions in 50 mM buffers having prescribed pHs at 4_C for 24 hours, adjusting the pH of each solution to 8.0, and assaying the remaining enzyme activity of each solution.
  • the optimum temperature of the enzyme was about 50_C when incubated at pH 6.0 for 30 min.
  • the optimum pH of the enzyme was about 6.5 when incubated at 35_C for 30 min.
  • the thermal stability of the enzyme was determined by incubating the testing enzyme solutions in 20 mM acetate buffer (pH 6.0) at prescribed temperatures for 60 min, cooling with water the resulting enzyme solutions, and assaying the remaining enzyme activity of each solution.
  • the pH stability of the enzyme was determined by keeping the testing enzyme solutions in 50 mM buffers having prescribed pHs at 4_C for 24 hours, adjusting the pH of each solution to 6.0, and assaying the remaining enzyme activity of each solution. These results are respectively in FIG. 35 (thermal stability) and FIG. 36 (pH stability). As a result, the enzyme had thermal stability of up to about 45_C and pH stability of about 4.5 to about 9.0.
  • a liquid nutrient culture medium consisting of 4.0% (w/v) of "PINE-DEX #4", a partial starch hydrolysate, 1.8% (w/v) of "ASAHIMEAST", a yeast extract, 0.1% (w/v) of dipotassium phosphate, 0.06% (w/v) of sodium phosphate dodecahydrate, 0.05% (w/v) magnesium sulfate heptahydrate, and water was placed in 500-ml Erlenmeyer flasks in a volume of 100 ml each, autoclaved at 121_C for 20 minutes to effect sterilization, cooled, inoculated with a stock culture of Arthrobacter ramosus S1, FERM BP-7592, and incubated at 27_C for 48 hours under rotary shaking conditions of 230 rpm for use as a seed culture.
  • the resulting supernatant was fed affinity column chromatography using 500 ml of "SEPHACRYL HR S-200" gel.
  • the enzyme was adsorbed on the gel and then eluted sequentially with a linear gradient decreasing from 1 M to O M of ammonium sulfate and with a linear gradient increasing from 0% (w/v) to 5% (w/v) maltotetraose, resulting in an elution of the enzyme from the gel at a concentration of about 2% (w/v) maltotetraose and collecting fractions with the enzyme activity.
  • the fractions were pooled and dialyzed against 10 mM phosphate buffer (pH 7.0) containing 1 M ammonium sulfate, and the dialyzed solution was centrifuged to remove impurities. The supernatant thus obtained was fed to hydrophobic column chromatography using 380 ml of "BUTYL-TOYOPEARL 650M" gel. When eluted with a linear gradient decreasing from 1 M to 0 M ammonium sulfate, the ⁇ -isomaltosyl-transferring enzyme adsorbed on the gel was eluted therefrom at about 0.3 M ammonium sulfate, followed by collecting fractions with the enzyme activity for a purified enzyme specimen.
  • the amount of enzyme activity, specific activity, and yield of the ⁇ -isomaltosylglucosaccharide-forming enzyme in each purification step are in Table 20.
  • Table 20 Purification step Enzyme* activity (unit) Specific activity of enzyme* (unit/mg protein) Yield (%) Culture supernatant 7,920 0.47 100 Dialyzed solution after salting out with ammonium sulfate 6,000 3.36 75.8 Eluate from affinity column chromatography 5,270 29.9 66.5 Eluate from hydrophobic column chromatography 4,430 31.1 55.9 Note: The symbol "*" means ⁇ -isomaltosyl-transferring enzyme.
  • the purified ⁇ -isomaltosyl-transferring enzyme specimen in this experiment was assayed for purity on gel electrophoresis using a 7.5% (w/v) polyacrylamide gel and detected on the gel as a single protein band, i.e., a high purity enzyme specimen.
  • a fresh preparation of the above purified specimen was subjected to isoelectrophoresis using a gel containing 2% (w/v) ampholine commercialized by Amersham Corp., Div. Amersham International, Arlington Heights, IL, USA, and then measured for pHs of protein bands and gel to determine the isoelectric point of the enzyme, revealing that the enzyme had an isoelectric point of about 4.2 ⁇ 0.5.
  • the influence of temperature and pH on the activity of ⁇ -isomaltosyl-transferring enzyme was examined in accordance with the assay for the enzyme activity. These results are in FIG. 37 (influence of temperature) and FIG. 38 (influence of pH).
  • the optimum temperature of the enzyme was about 50_C when incubated at pH 6.0 for 30 min.
  • the optimum pH of the enzyme was about 6.0 when incubated at 35_C for 30 min.
  • the thermal stability of the enzyme was determined by incubating the testing enzyme solutions at prescribed temperatures for 60 min in 20 mM acetate buffer (pH 6.0), cooling with water the resulting enzyme solutions, and assaying the remaining enzyme activity of each solution.
  • the pH stability of the enzyme was determined by keeping the testing enzyme solutions in 50 mM buffers having prescribed pHs at 4_C for 24 hours, adjusting the pH of each solution to 6.0, and assaying the remaining enzyme activity of each solution. These results are respectively in FIG. 39 (thermal stability) and FIG. 40 (pH stability). As a result, the enzyme had thermal stability of up to about 45_C and had pH stability of about 3.6 to about 9.0.
  • saccharides can be used as substrates for the ⁇ -isomaltosylglucosaccharide-forming enzyme.
  • the ⁇ -isomaltosylglucosaccharide-forming enzyme of the present invention well acted on saccharides having a glucose polymerization degree of at least three and having a maltose structure at their non-reducing ends, among the saccharides tested. It was also found that the enzyme slightly acted on saccharides, having a glucose polymerization degree of two, such as maltose, kojibiose, nigerose, neotrehalose, maltotriitol, and erlose.
  • aqueous solution containing one percent (w/v) of maltose, maltotriose, maltotetraose, or maltopentaose was added a purified specimen of ⁇ -isomaltosylglucosaccharide-forming enzyme obtained by the method in Experiment 7-2 in an amount of two units/g solid for the aqueous solutions of maltose and maltotriose, 0.2 unit/g solid for maltotetraose, and 0.1 unit/g solid for maltopentaose, followed by incubation at 35_C and pH 6.0 for eight hours. After a 10-min incubation at 100_C, the enzymatic reaction was suspended.
  • the resulting reaction solutions were respectively measured for saccharide composition on HPLC using "YMC PACK ODS-AQ303", a column commercialized by YMC Co., Ltd., Tokyo, Japan, at a column temperature of 40_C and a flow rate of 0.5 ml/min of water, and using as a detector "RI-8012", a differential refractometer commercialized by Tosoh Corporation, Tokyo, Japan.
  • the results are in Table 23.
  • glucose and ⁇ -isomaltosylglucose alias 6 2 -O- ⁇ -glucosylmaltose or panose were mainly formed maltose as a substrate; and maltose and ⁇ -isomaltosylglucose alias 6 3 -O- ⁇ -glucosylmaltotriose were mainly formed along with small amounts of glucose, maltotetraose, ⁇ -isomaltosylglucose alias 6 2 -O- ⁇ -glucosylmaltose or panose, and the product X.
  • maltotriose and the product X were mainly formed from maltotetraose as a substrate along with small amounts of maltose, maltopentaose, ⁇ -isomaltosylglucose alias 6 3 -O- ⁇ -glucosylmaltotriose; and the product Y; and that maltotetraose and the product Y were mainly formed from maltopentaose as a substrate along with small amounts of maltotriose, maltohexaose, and the products X and Z.
  • the product X as a main product from maltotetraose as a substrate and the product Y as a main product from maltopentaose as a substrate were respectively isolated and purified as follows:
  • the products X and Y were respectively purified on HPLC using "YMC PACK ODS-A R355-15S-15 12A", a separatory HPLC column commercialized by YMC Co., Ltd., Tokyo, Japan, to isolate a specimen of the product X having a purity of at least 99.9% from the reaction product from maltotetraose in a yield of about 8.3%, d.s.b., and a specimen of the product Y having a purity of at least 99.9% from the reaction product from maltotetraose in a yield of about 11.5%, d.s.b.
  • FIG. 41 is a 1 H-NMR spectrum for the product X
  • FIG. 42 is for the product Y.
  • the 13 C-NMR spectra for the products X and Y are respectively FIGs. 43 and 44 .
  • the assignment of the products X and Y are tabulated in Table 25.
  • Table 24 Analyzed methyl compound Ratio Product X Product Y 2,3,4-trimethyl compound 1.00 1.00 2,3,6-trimethyl compound 3.05 3.98 2,3,4,6-tetramethyl compound 0.82 0.85
  • the product X formed from maltotetraose via the action of the ⁇ -isomaltosylglucosaccharide-forming enzyme of the present invention was revealed as a pentasaccharide, in which a glucose residue bounds via the ⁇ -linkage to OH-6 of glucose at the non-reducing end of maltotetraose, i.e., ⁇ -isomaltosylmaltotriose alias 6 4 -O- ⁇ -glucosylmaltotetraose, represented by Formula 1.
  • the following test was carried out to study whether the ⁇ -isomaltosylglucosaccharide-formation enzyme of the present invention had the ability of forming reducing power.
  • a 1% (w/v) aqueous solution of maltotetraose as a substrate was added 0.25 unit/g substrate, d.s.b., of either of purified specimens of ⁇ -isomaltosylglucosaccharide-forming enzyme from Bacillus globisporus C9 obtained by the method in Experiment 4-2, Bacillus globisporus C11 obtained by the method in Experiment 7-2, Bacillus globisporus N75 obtained by the method in Experiment 11-2, or Arthrobacter globiformis A19 obtained by the method in Experiment 15-2, and incubated at 35_C and pH 6.0, except that pH 8.4 was used for the enzyme from Arthrobacter globiformis A19.
  • each reaction solution was sampled at prescribed time intervals and measured for reducing powder after keeping the sampled solutions at 100_C for 10 min to suspend the enzymatic reaction.
  • the reducing saccharide content and the total sugar content were respectively quantified by the Somogyi-Nelson's method and the anthrone-sulfuric acid reaction method.
  • ⁇ -isomaltosylglucosaccharide-formation enzyme of the present invention has the ability of forming dextran, it was tested in accordance with the method in Bioscience Biotechnology and Biochemistry, Vol. 56, pp. 169-173 (1992 ).
  • the reaction was suspended by heating at 100_C for 15 min. Fifty microliters of each of the reaction mixtures were placed in a centrifugation tube and then admixed and sufficiently stirred with 3-fold volumes of ethanol, followed by standing at 4_C for 30 min. Thereafter, each mixture solution was centrifuged at 15,000 rpm for five minutes and, after removing supernatant, the resulting sediment was admixed with one milliliter of 75% (w/w) ethanol solution and stirred for washing. The resulting each solution was centrifuged to remove supernatant, dried in vacuo, and then admixed and sufficiently stirred with one milliliter of deionized water.
  • the total sugar content, in terms of glucose, of each resulting solution was quantified by the phenol-sulfuric acid method.
  • the total sugar content was determined similarly as in the above except for using either of purified specimens of ⁇ -isomaltosylglucosaccharide-forming enzyme from Bacillus globisporus C9, Bacillus globisporus C11, Bacillus globisporus N75, and Arthrobacter globiformis A19, which had been inactivated at 100_C for 10 min.
  • the content of dextran formed was calculated by the following equation:
  • reaction mixtures of the post-enzymatic reactions were analyzed on gas chromatography (abbreviated as "GLC” hereinafter) for monosaccharides and disaccharides as acceptors, and on HPLC for trisaccharides as acceptors to confirm whether these saccharides could be used as their transfer acceptors.
  • LLC gas chromatography
  • GLC apparatus "GC-16A” commercialized by Shimadzu Corporation, Tokyo, Japan
  • column a stainless-steel column, 3 mm in diameter and 2 m in length, packed with 2% "SILICONE OV-17/CHROMOSOLV W", commercialized by GL Sciences Inc., Tokyo, Japan
  • carrier gas nitrogen gas at a flow rate of 40 ml/min under temperature conditions of increasing from 160_C to 320_C at an increasing temperature rate of 7.5_C/min
  • detection a hydrogen flame ionization detector.
  • HPLC apparatus "CCPD” commercialized by Tosoh Corporation, Tokyo, Japan
  • ODS-AQ-303 commercialized by YMC Co., Ltd., Tokyo, Japan
  • eluent water at a flow rate of 0.5 ml/min
  • detection a differential refractometer.
  • Table 28 The results are in Table 28.
  • the ⁇ -isomaltosylglucosaccharide of the present invention utilizes different types of saccharides as transfer acceptors;
  • the ⁇ -isomaltosylglucosaccharide-forming enzyme from Stains C9, C11 and N75 advantageously transfer, particularly, to D-/L-xylose, methyl- ⁇ -glucopyranoside, methyl- ⁇ -glucopyranoside, trehalose, isomaltose, isomaltotriose, cellobiose, gentibiose, maltitol, lactose, and sucrose; then transfer to D-glucose, D-fructose, D-fucose, D-psicose, L-sorbose, N-acetylglucosamine, glycerol, and L-ascorbic acid; and further to D-arabinose.
  • the ⁇ -isomaltosylglucosaccharide-forming enzyme from Strain A19 well transfers, particularly, to methyl- ⁇ -glucopyranoside, methyl- ⁇ -glucopyranoside, trehalose, cellobiose, maltitol, lactose, and sucrose; then transfers to D-glucose, D-/L-xylose, D-fructose, D-psicose, L-sorbose, isomaltose, gentibiose, glycerol, and L-ascorbic acid; and further to D-galactose, D-mannose, D-arabinose, D-fucose, and isomaltotriose.
  • Table 29 Property ⁇ -Isomaltosyl-glucosaccharide-forming enzyme of the present invention Dextrin dextranase Transglucosidase Strain C9 Strain C11 Strain N75 Strain A19 Control Control Hydrolysis activity Negative Negative Negative Negative Negative Mainly positive Optimum pH 6.0-6.5 6.0 6.0 8.4 4.0-4.2 3.5 Inhibition by EDTA Positive Positive Positive Positive Negative Negative Negative
  • the ⁇ -isomaltosylglucosaccharide-forming enzyme of the present invention had outstandingly novel physicochemical properties completely different from those of known dextrin dextranase and transglucosidase.
  • the test on the formation of cyclotetrasaccharide by the ⁇ -isomaltosylglucosaccharide-forming enzyme and ⁇ -isomaltosyl-transferring enzyme was conducted using saccharides.
  • the formation level was relatively low as below about 11% when ⁇ -isomaltosyl-transferring enzyme was allowed to act on the saccharides after the action of ⁇ -isomaltosylglucosaccharide-forming enzyme, while the level was increased by simultaneously allowing the enzymes to act on every saccharide tested, particularly, increased to about 87% and about 64% when allowed to act on glycogen and partial starch hydrolyzate, respectively.
  • a 15% corn starch suspension was prepared, admixed with 0.1% calcium carbonate, adjusted to pH 6.0, and then mixed with 0.2-2.0% per gram starch of "TERMAMYL 60L", an ⁇ -amylase specimen commercialized by Novo Indutri A/S, Copenhagen, Denmark, followed by the enzymatic reaction at 95_C for 10 min. Thereafter, the reaction mixture was autoclaved at 120_C for 20 min, promptly cooled to about 35_C to obtain a liquefied starch with a DE (dextrose equivalent) of 3.2-20.5.
  • a suitable liquefaction degree is a DE of about 20 or lower, preferably, DE of about 12 or lower, more preferably, DE of about 5 or lower.
  • the formation yield of cyclotetrasaccharide was about 64% at a low concentration of 0.5%, while it was about 40% at a high concentration of 40%.
  • a 15% aqueous solution of "PINE-DEX #100", a partial starch hydrolyzate was prepared and admixed with one unit/g solid of a purified specimen of ⁇ -isomaltosylglucosaccharide-forming enzyme from Strain C11 obtained by the method in Experiment 7-2, 10 units/g solid of a purified specimen of ⁇ -isomaltosyl-transferring enzyme from Strain C11 obtained by the method in Experiment 7-3, and 0-0.5 unit/g solid of cyclodextrin glucanotransferase (CGTase) from a microorganism of the species Bacillus stearothermophilus, followed by the coaction of these enzymes at 30_C and pH 6.0 for 48 hours.
  • CTTase cyclodextrin glucanotransferase
  • reaction mixture was heated at 100_C for 10 min to inactivate the remaining enzymes, and a portion of the reaction mixture was sampled and then quantified on HPLC for the formation yield of cyclotetrasaccharide, revealing that it contained about 84% cyclotetrasaccharide, on a saccharide composition basis.
  • the reaction mixture was adjusted to pH 5.0 and 45_C, and then treated with ⁇ -glucosidase and glucoamylase similarly as in Experiment 1 to hydrolyze the remaining reducing oligosaccharides, etc.
  • the resulting mixture was adjusted to pH 5.8 by the addition of sodium hydroxide and then incubated at 90_C for one hour to inactivate the remaining enzymes and filtered to remove insoluble substances.
  • the filtrate was concentrated using a reverse osmosis membrane to give a concentration of about 16%, d.s.b., and the concentrate was in a usual manner decolored, desalted, filtered, and concentrated to obtain about 6.2 kg of a saccharide solution with a solid content of about 3,700 g.
  • the saccharide solution was fed to a column packed with about 225 L of "AMBERLITE CR-1310 (Na-form)", an ion-exchange resin commercialized by Japan Organo Co., Ltd., Tokyo, Japan, and chromatographed at a column temperature of 60_C and a flow rate of about 45 L/h. While the saccharide composition of eluate from the column was monitoring by HPLC as described in Experiment 1, fractions of cyclotetrasaccharide with a purity of at least 98% were collected, and in a usual manner desalted, decolored, filtered, and concentrated to obtain about 7.5 kg of a saccharide solution with a solid content of about 2,500 g solids. HPLC measurement for saccharide composition of the saccharide solution revealed that it contained cyclotetrasaccharide with a purity of about 99.5%.
  • FIG. 45 is a microscopic photograph of such cyclotetrasaccharide.
  • the above crystallized concentrate was separated by a centrifugal filter to obtain 1,360 g of a crystalline product by wet weight, which was then further dried at 60_C for three hours to obtain 1,170 g of a crystalline powder of cyclotetrasaccharide.
  • HPLC measurement of the crystalline powder revealed that it contained cyclotetrasaccharide with a quite high purity of at least 99.9%.
  • the cyclotetrasaccharide in a crystalline powder form had a diffraction spectrum having characteristic main diffraction angles (2 ⁇ ) of 10.1_, 15.2_, 20.3_, and 25.5_ in FIG. 46 .
  • the Karl Fischer method of the crystalline powder revealed that it had a moisture content of 13.0%, resulting in a finding that it was a crystal of cyclotetrasaccharide having five or six moles of water per one mole of the crystal.
  • thermogravimetric analysis of the cyclotetrasaccharide in a crystalline form gave a thermogravimetric curve in FIG. 47 . Based on the relationship between the weight change and the temperature, it was successively found that the weight reduction corresponding to four or five moles of water was observed up to a temperature of 150_C, the weight reduction corresponding to one mole of water at around 250_C, and the weight reduction corresponding to the decomposition of cyclotetrasaccharide at a temperature of about 280_C or higher.
  • the powder x-ray analysis of the cyclotetrasaccharide powder thus obtained gave a characteristic diffraction spectrum having main diffraction angles (2 ⁇ ) of 8.3_, 16.6_, 17.0_, and 18.2_ in FIG. 48 .
  • the Karl Fischer method of the crystalline powder revealed that it had a moisture content of about 2.7%, resulting in a finding that it was a crystal of cyclotetrasaccharide having one mole of water per one mole of the crystal.
  • the thermogravimetric analysis of the cyclotetrasaccharide in a crystalline powder gave a thermogravimetric curve in FIG. 49 . Based on the relationship between the weight change and the temperature, it was found that the weight reduction corresponding to one mole of water was observed at a temperature of about 270_C and further observed the weight reduction corresponding to the decomposition of cyclotetrasaccharide per se at a temperature of about 290_C or higher. These results confirmed that the cyclotetrasaccharide crystal in this experiment was cyclotetrasaccharide, monohydrate.
  • the Karl Fischer method of the resulting crystalline powders revealed that the one dried at 40_C had a moisture content of about 4.2%, while the other dried at 120_C had a moisture content of about 0.2%, meaning that it was substantially anhydrous.
  • the powder x-ray analysis of the above cyclotetrasaccharide dried in vacuo at 40_ and 120_C gave characteristic diffraction spectra having main diffraction angles (2 ⁇ ) of 10.8_, 14.7_, 15.0_, 15.7_, and 21.5_ in FIG. 50 for 40_C and FIG. 51 for 120_C.
  • the cyclotetrasaccharide powder with a moisture content of about 4.2% obtained by drying in vacuo at 40_C, was estimated to be a mixture powder of an amorphous cyclotetrasaccharide with such a moisture content and anhydrous crystalline cyclotetrasaccharide.
  • the thermogravimetric analysis of anhydrous cyclotetrasaccharide with a moisture content of 0.2% which was conducted similarly as in Experiment 31, observed only a weight reduction as shown in FIG. 52 , deemed to be induced by the heat decomposition at a temperature of about 270_C or higher as shown in FIG. 52 .
  • cyclotetrasaccharide is a thermostable saccharide because an aqueous solution of cyclotetrasaccharide was not colored and the purity of the saccharide composition was not lowered even when heated at a high temperature of 120_C.
  • Four milliliters of the resulting solution were placed in a glass test tube, sealed, and heated at 100_C for 30 to 90 min. After allowing to stand for cooling at ambient temperature, each of the resulting solutions was measured for coloration degree to examine on their amino carbonyl reactivity.
  • the coloration degree was evaluated based on the absorbance in a cell with 1-cm light pass at a wavelength of 480 nm. The results are in Table 37.
  • cyclotetrasaccharide was not colored even when heated in the presence of glycine, meaning that the saccharide does not induce browning with glycine, i.e., cyclotetrasaccharide is a stable saccharide which does not induce the amino carbonyl reaction, alias the Maillard reaction.
  • Four milliliters of the resulting solution were placed in a glass test tube, sealed, and heated at 100_C for 30 to 90 min. After allowing to stand for cooling at ambient temperature, each of the resulting solution was measured for coloration degree to examine on their amino carbonyl reactivity.
  • similar inclusion products were prepared by using "ISOELITE TM P", a branched cyclodextrin commercialized by Maruha K.K., Tokyo, Japan, which were known to have inclusion ability.
  • a 6% (w/v) aqueous solution of a commercialized granulated sugar as a standard a sensory test with eight panelists was conducted.
  • the sweetening power of cyclotetrasaccharide was about 27% of that of sucrose.
  • Cyclotetrasaccharide was added in an amount of about 7% by weight to the internal content of rat cecum, and the contents of cyclotetrasaccharide still remained just after and 12 hours after the addition of the internal content was quantified on gas chromatography. As a result, the contents of cyclotetrasaccharide of the former and latter were respectively 68.0 mg and 63.0 mg per one gram of the internal content of rat cecum. These data confirmed that cyclotetrasaccharide is a substantially non-fermentable saccharide.
  • cyclotetrasaccharide is not substantially assimilated or absorbed by living bodies when orally taken and can be expected to be used as a non- or low-caloric edible material in diet sweeteners, fillers for sweeteners with a relatively high sweetening power, and viscosity agents, fillers and bodies for diet food products, and further can be used as an edible fiber and food material for substituting fats.
  • Example A describes the cyclotetrasaccharide and the process for producing saccharide composition comprising the same, and Example B describes the composition comprising the cyclotetrasaccharide or the saccharide composition:
  • a potato starch was prepared into an about 2% starch suspension, admixed with calcium chloride to give a final concentration of 1 mM, adjusted to pH 6.0, and heated at 95_C for about 20 min to gelatinize the starch. The resulting mixture was then cooled to about 35_C and admixed with 0.25 ml of the above concentrated enzyme solution to one gram of the starch, d.s.b., followed by the enzymatic reaction at pH 6.0 and 35_C for 48 hours. The reaction mixture was heated to and kept at 95_C for 10 min, and then cooled and filtered.
  • the filtrate was in a conventional manner decolored with an activated charcoal, desalted and purified with ion exchangers in H- and OH-forms, and further concentrated and spray-dried to obtain a powder containing cyclotetrasaccharide in a yield of about 90% to the material starch, d.s.b.
  • the product contains, on a dry solid basis, 0.7% glucose, 1.4% isomaltose, 11.1% maltose, 62.1% cyclotetrasaccharide, and 24.7% of other saccharides and has a mild sweetness and an adequate viscosity, moisture-retaining ability, and inclusion ability, it can be advantageously used in a variety of compositions such as food products, cosmetics, and pharmaceuticals as a sweetener, taste-improving agent, quality-improving agent, syneresis-preventing agent, stabilizer, discoloration-preventing agent, filler, inclusion agent, and base for pulverization.
  • a potato starch was prepared into an about 6% starch suspension, admixed with calcium carbonate to give a final concentration of 0.1%, adjusted to pH 6.0, further admixed with 0.2% per gram starch, d.s.b., of "TERMAMYL 60L", an ⁇ -amylase commercialized by Novo Industri A/S, Copenhagen, Denmark, and then heated at 95_C for about 10 min. Thereafter, the mixture was autoclaved at 120_C for 20 min and then promptly cooled to about 35_C to obtain a liquefied solution with a DE (dextrose equivalent) of about four.
  • DE dexrose equivalent
  • Example A-1 To the liquefied solution was added 0.25 ml per gram starch, d.s.b., of the concentrated enzyme solution in Example A-1 containing ⁇ -isomaltosylglucosaccharide-forming enzyme and ⁇ -isomaltosyl-transferring enzyme, followed by the enzymatic reaction at pH 6.0 and 35_C for 48 hours. The reaction mixture was heated to and kept at 95_C for 10 min and then cooled and filtered.
  • the filtrate was in a conventional manner decolored with an activated charcoal, desalted and purified with ion exchangers in H- and OH-forms, and then concentrated into a 60% cyclotetrasaccharide syrup in a yield of about 90% to the material starch, d.s.b.
  • the product contains, on a dry solid basis, 0.9% glucose, 1.5% isomaltose, 11.3% maltose, 60.1% cyclotetrasaccharide, and 26.2% of other saccharides and has a mild sweetness and an adequate viscosity, moisture-retaining ability, and inclusion ability, it can be advantageously used in a variety of compositions such as food products, cosmetics, and pharmaceuticals as a sweetener, taste-improving agent, quality-improving agent, syneresis-preventing agent, stabilizer, discoloration-preventing agent, filler, and inclusion agent.
  • a tapioca starch was prepared into an about 25% starch suspension which was then admixed with 0.2% per gram starch, d.s.b., of "NEO-SPITASE", an ⁇ -amylase commercialized by Nagase Biochemicals, Ltd., Kyoto, Japan. Thereafter, the reaction mixture was autoclaved at 120_C for 20 min and then promptly cooled to about 35_C to obtain a liquefied solution with a DE of about four.
  • the reaction mixture was heated to and kept at 95_C for 30 min and then cooled and filtered, and then adjusted to pH 5.0 and 50_C and admixed with 300 units/g starch, d.s.b., of "TRANSGLUCOSIDASE L AMANO TM ", an ⁇ -glucosidase commercialized by Amano Pharmaceutical Co., Ltd., Aichi, Japan, followed by the enzymatic reaction for 24 hours. Further the reaction mixture was mixed with 30 units/g starch, d.s.b., "GLUCOZYME", a glucoamylase preparation commercialized by Nagase Biochemicals, Ltd., Kyoto, Japan, and then enzymatically reacted for 17 hours.
  • GLUCOZYME a glucoamylase preparation commercialized by Nagase Biochemicals, Ltd., Kyoto, Japan
  • the reaction mixture thus obtained was heated to and kept at 95_C for 30 min, and then cooled and filtered to obtain a filtrate.
  • the resulting filtrate was in a conventional manner decolored with an activated charcoal, desalted and purified with ion exchangers in H- and OH-forms, and then concentrated into a 60% cyclotetrasaccharide syrup in a yield of about 90% to the material starch, d.s.b.
  • the product contains, on a dry solid basis, 38.4% glucose, 58.1% cyclotetrasaccharide, and 3.5% of other saccharides and has a mild sweetness and an adequate viscosity, moisture-retaining ability, and inclusion ability, it can be advantageously used in a variety of compositions such as food products, cosmetics, and pharmaceuticals as a sweetener, taste-improving agent, quality-improving agent, syneresis-preventing agent, stabilizer, discoloration-preventing agent, filler, and inclusion agent.
  • a potato starch was prepared into an about 20% starch suspension, admixed with calcium carbonate to give a final concentration of 0.1%, adjusted to pH 6.5, further admixed with 0.3% per gram starch, d.s.b., of "TERMAMYL 60L", an ⁇ -amylase commercialized by Novo Industri A/S, Copenhagen, Denmark, and then enzymatically reacted at 95_C for about 15 min. Thereafter, the mixture was autoclaved at 120_C for 20 min and then promptly cooled to about 35_C to obtain a liquefied solution with a DE of about four.
  • Example A-3 To the liquefied solution was added 0.25 ml per gram starch, d.s.b., of the concentrated enzyme solution in Example A-3 containing ⁇ -isomaltosylglucosaccharide-forming enzyme and ⁇ -isomaltosyl-transferring enzyme, followed by the enzymatic reaction at pH 6.0 and 35_C for 48 hours.
  • the reaction mixture was heated to and kept at 95_C for 30 min and then adjusted to pH 5.0 and 50_C, followed by the enzymatic reaction for 24 hours after the addition of 300 units/g solid of "TRANSGLUCOSIDASE L AMANO TM ", an ⁇ -glucosidase commercialized by Amano Pharmaceutical Co., Ltd., Aichi, Japan, and then the enzymatic reaction for 17 hours after the addition of 30 units/g solid of "GLUCOZYME", a glucoamylase preparation commercialized by Nagase Biochemicals, Ltd., Kyoto, Japan.
  • the resulting reaction mixture was heated to and kept at 95_C for 30 min, and then cooled and filtered.
  • the filtrate thus obtained was in a conventional manner decolored with an activated charcoal, desalted and purified with ion exchangers in H- and OH-forms, and then concentrated into a 60% cyclotetrasaccharide syrup in a yield of about 90% to the material starch, d.s.b.
  • the product contains, on a dry solid basis, 34.2% glucose, 62.7% cyclotetrasaccharide, and 3.1% of other saccharides and has a mild sweetness and an adequate viscosity, moisture-retaining ability, and inclusion ability, it can be advantageously used in a variety of compositions such as food products, cosmetics, and pharmaceuticals as a sweetener, taste-improving agent, quality-improving agent, syneresis-preventing agent, stabilizer, discoloration-preventing agent, filler, and inclusion agent.
  • Cyclotetrasaccharide syrup obtained by the method in Example A-3 was column chromatographed using "AMBERLITE CR-1310 (Na-form)", a strong acid cation-exchange resin commercialized by Japan Organo Co., Ltd., Tokyo, Japan.
  • the resin was packed into four jacketed stainless steel columns having a diameter of 5.4 cm, which were then cascaded in series to give a total gel bed depth of 20 m.
  • the saccharide syrup was fed to the columns in a volume of 5% (v/v) and fractionated by feeding to the columns hot water heated to 60_C at an SV (space velocity) of 0.13 to obtain high cyclotetrasaccharide content fractions while monitoring the saccharide composition of eluate on HPLC, and then purifying the fractions to obtain a high cyclotetrasaccharide content solution in a yield of about 21% to the material starch, d.s.b.
  • the solution contained about 98%, d.s.b., of cyclotetrasaccharide.
  • the solution was concentrated to give a concentration of about 70% and then placed in a crystallizer, admixed with about 2% of crystalline cyclotetrasaccharide, penta- or hexa-hydrate, and gradually cooled to obtain a massecuite with a crystallinity of about 45%.
  • the massecuite was sprayed from a nozzle equipped on top of a drying tower at a high pressure of 150 kg/cm 2 . Simultaneously, hot air heated to 85_C was being blown down from the upper part of the drying tower, and the resulting crystalline powder was collected on a transporting wire conveyor provided on the basement of the tower and gradually moved out of the tower while blowing thereunto a hot air heated to 45_C.
  • the resulting crystalline powder was injected to an ageing tower and aged for 10 hours while a hot air was being blown to the contents to complete the crystallization and drying to obtain a crystalline powder of cyclotetrasaccharide, penta- or hexa-hydrate.
  • the product has a relatively low reducibility, does substantially neither cause the amino carbonyl reaction nor exhibit hygroscopicity, and has a satisfactory handleability, mild low sweetness, adequate viscosity, moisture-retaining ability, inclusion ability, and substantially non-digestibility, it can be advantageously used in a variety of compositions such as food products, cosmetics, and pharmaceuticals as a sweetener, materials for relatively low caloric foods, taste-improving agent, flavor and taste-improving agent, quality-improving agent, syneresis-preventing agent, stabilizer, discoloration-preventing agent, filler, inclusion agent, and base for pulverization.
  • compositions such as food products, cosmetics, and pharmaceuticals as a sweetener, materials for relatively low caloric foods, taste-improving agent, flavor and taste-improving agent, quality-improving agent, syneresis-preventing agent, stabilizer, discoloration-preventing agent, filler, inclusion agent, and base for pulverization.
  • the syrup as a material saccharide solution was column chromatographed using a strong acid cation-exchange resin in accordance with the method in Example A-5, followed by collecting and purifying high cyclotetrasaccharide content fractions to obtain a high cyclotetrasaccharide content solution in a yield of about 90% to the material starch, d.s.b.
  • the solution was concentrated to give a concentration of about 85% and then gradually cooled while stirring to proceed crystallization.
  • the resultant was transferred to a plastic vessel and allowed to stand at ambient temperature for crystallizing and ageing the contents.
  • the resulting block was pulverized by a cutter to obtain a crystalline powder of cyclotetrasaccharide, penta- or hexa-hydrate.
  • the product does not substantially have hygroscopicity, has a satisfactory handleability, mild low sweetness, adequate viscosity, moisture-retaining ability, inclusion ability, and substantially non-digestibility, it can be advantageously used in a variety of compositions such as food products, cosmetics, and pharmaceuticals as a sweetener, materials for relatively low caloric foods, taste-improving agent, flavor and taste-improving agent, quality-improving agent, syneresis-preventing agent, stabilizer, discoloration-preventing agent, filler, inclusion agent, and base for pulverization.
  • compositions such as food products, cosmetics, and pharmaceuticals as a sweetener, materials for relatively low caloric foods, taste-improving agent, flavor and taste-improving agent, quality-improving agent, syneresis-preventing agent, stabilizer, discoloration-preventing agent, filler, inclusion agent, and base for pulverization.
  • a high cyclotetrasaccharide content solution obtained by the method in Example A-6, was continuously crystallized while concentrating.
  • the resulting massecuite was separated by a basket-type centrifuge to obtain crystals which were then sprayed with a small amount of water to obtain a high purity cyclotetrasaccharide, penta- or hexa-hydrate, in a yield of about 55%, d.s.b., to the material contents.
  • the product contains at least 98%, d.s.b., of a high purity crystalline cyclotetrasaccharide, penta- or hexa-hydrate, has a relatively low reducibility, does substantially neither cause the amino carbonyl reaction nor exhibit hygroscopicity, and has a satisfactory handleability, mild low sweetness, adequate viscosity, moisture-retaining ability, inclusion ability, and substantially non-digestibility, it can be advantageously used in a variety of compositions such as food products, cosmetics, pharmaceuticals, industrial reagents, and chemical materials as a sweetener, materials for relatively low caloric foods, taste-improving agent, flavor and taste-improving agent, quality-improving agent, syneresis-preventing agent, stabilizer, discoloration-preventing agent, filler, inclusion agent, and base for pulverization.
  • compositions such as food products, cosmetics, pharmaceuticals, industrial reagents, and chemical materials as a sweetener, materials for relatively low caloric foods, taste-improving
  • a liquid nutrient culture medium consisting of 5.0% (w/v) corn phytoglycogen, 1.0% (w/v) of "ASAHIMEAST", a yeast extract, 0.1% (w/v) of dipotassium phosphate, 0.06% (w/v) of sodium phosphate dodecahydrate, 0.05% (w/v) magnesium sulfate heptahydrate, and water, was placed in a 30-L fermentor in a volume of about 20 L, autoclaved at 121_C for 20 minutes to effect sterilization, cooled to 27_C, inoculated with 1% (v/v) of a seed culture of Bacillus globisporus C11, FERM BP-7144, prepared in accordance with the method in Experiment 6, and incubated at 27_C and pH 6.0-7.0 for 72 hours under aeration and agitation conditions.
  • the resultant culture was sterilized by heating at 121_C for 20 min, cooled, and centrifuged. The supernatant was collected and membrane filtered with a UF membrane. The resulting filtrate was in a usual manner decolored with an activated charcoal and desalted and purified with ion exchangers in H- and OH-forms to obtain a solution containing cyclotetrasaccharide in a yield of about 40%, d.s.b., to the material phytoglycogen. The solution thus obtained contained about 87%, d.s.b., of cyclotetrasaccharide.
  • the above solution was continuously crystallized while concentrating, and the resulting massecuite was separated by a basket-type centrifuge to obtain crystals which were then sprayed with a small amount of water to obtain cyclotetrasaccharide, penta- or hexa-hydrate, with a purity of at least 98% in a yield of about 25%, d.s.b., to the material phytoglycogen.
  • the product a high purity cyclotetrasaccharide, penta- or hexa-hydrate, has a relatively low reducibility, does substantially neither cause the amino carbonyl reaction nor exhibit hygroscopicity, and has a satisfactory handleability, mild low sweetness, adequate viscosity, moisture-retaining ability, inclusion ability, and substantially non-digestibility, it can be advantageously used in a variety of compositions such as food products, cosmetics, pharmaceuticals, industrial reagents, and chemical materials as a sweetener, materials for relatively low caloric foods, taste-improving agent, flavor and taste-improving agent, quality-improving agent, syneresis-preventing agent, stabilizer, discoloration-preventing agent, filler, inclusion agent, and base for pulverization.
  • compositions such as food products, cosmetics, pharmaceuticals, industrial reagents, and chemical materials as a sweetener, materials for relatively low caloric foods, taste-improving agent, flavor and taste-improving agent, quality-improving agent, syn
  • a corn starch was prepared into an about 30% starch suspension which was then admixed with calcium carbonate to give a concentration of 0.1%, adjusted to pH 6.5, admixed with 0.3% per gram starch, d.s.b., of "TERMAMYL 60L", an ⁇ -amylase commercialized by Novo Industri A/S, Copenhagen, Denmark,", an ⁇ -amylase commercialized by Nagase Biochemicals, Ltd., Kyoto, Japan, and enzymatically reacted at 95_C for 15 min. Thereafter, the reaction mixture was autoclaved at 120_C for 20 min and then promptly cooled to about 51_C to obtain a liquefied solution with a DE of four.
  • reaction mixture was heated to and kept at 95_C for 30 min, then adjusted to pH 5.0 and 50_C, followed by the 24-hour enzymatic reaction after the addition of 300 units/g solid of "TRANSGLUCOSIDASE L AMINO TM ", an ⁇ -glucosidase commercialized by Amano Pharmaceutical Co., Ltd., Aichi, Japan, and then the 17-hour enzymatic reaction after the addition of 20 units/g solid of "GLUCOZYME", a glucoamylase preparation commercialized by Nagase Biochemicals, Ltd., Kyoto, Japan.
  • the resulting reaction mixture was heated to and kept at 95_C for 30 min, cooled, and filtered.
  • the resulting filtrate was in a usual manner decolored with an activated charcoal, desalted and purified with ion-exchangers in H- and OH-forms, and concentrated to obtain a syrup containing 44.0%, d.s.b., of cyclotetrasaccharide.
  • the syrup as a material saccharide solution was column chromatographed using a strong acid cation-exchange resin in accordance with the method in Example A-5, followed by collecting and purifying high cyclotetrasaccharide content fractions and then concentrating and spray drying the resultant to obtain a powder containing cyclotetrasaccharide in a yield of about 45%, d.s.b., to the material starch.
  • the product contains 3.7% glucose, 80.5% cyclotetrasaccharide, and 15.8% other saccharides, has a mild low sweetness, adequate viscosity, moisture-retaining ability, and inclusion ability, it can be advantageously used in a variety of compositions such as food products, cosmetics, pharmaceuticals as a sweetener, taste-improving agent, quality-improving agent, syneresis-preventing agent, stabilizer, discoloration-preventing agent, filler, inclusion agent, and base for pulverization.
  • compositions such as food products, cosmetics, pharmaceuticals as a sweetener, taste-improving agent, quality-improving agent, syneresis-preventing agent, stabilizer, discoloration-preventing agent, filler, inclusion agent, and base for pulverization.
  • a potato starch was prepared into an about 5% starch suspension which was then admixed with calcium carbonate to give a concentration of 0.1%, adjusted to pH 6.0, admixed with 0.2% per gram starch, d.s.b., of "TERMAMYL 60L", an ⁇ -amylase commercialized by Novo Industri A/S, Copenhagen, Denmark, and enzymatically reacted at 95_C for 10 min. Thereafter, the reaction mixture was autoclaved at 120_C for 20 min and then promptly cooled to about 40_C to obtain a liquefied solution with a DE of four.
  • the filtrate was in a usual manner decolored with an activated charcoal, desalted and purified with ion-exchangers in H- and OH-forms, and concentrated to obtain a syrup containing 70% (w/v) cyclotetrasaccharide in a yield of about 90%, d.s.b., to the material starch.
  • the product contains 2.5% glucose, 6.3% isomaltose, and 30.1% cyclotetrasaccharide, has a mild sweetness, adequate viscosity, moisture-retaining ability, and inclusion ability, it can be advantageously used in a variety of compositions such as food products, cosmetics, pharmaceuticals as a sweetener, taste-improving agent, quality-improving agent, syneresis-preventing agent, stabilizer, discoloration-preventing agent, filler, and inclusion agent.
  • the product has a satisfactory sweetness and a 2-fold higher sweetening power of sucrose. Since crystalline cyclotetrasaccharide, penta- or hexa-hydrate, is scarcely digested and fermented and is substantially free of calorie, the calorie of the product is about 1/10 of that of sucrose with respect to sweetening power. In addition, the product is substantially free from deterioration and stable when stored at ambient temperature. Thus, the product can be suitably used as a high quality low-caloric and less cariogenic sweetener.
  • Example A-2 One hundred parts by weight of a 55% (w/v) sucrose solution was admixed while heating with 50 parts by weight of a syrup containing cyclotetrasaccharide obtained by the method in Example A-2. The mixture was then concentrated by heating under reduced pressure to give a moisture content of less than 2%, and the concentrate was mixed with 0.6 part by weight of citric acid and an adequate amount of a lemon flavor, followed by forming in a usual manner the resultant into the desired product.
  • the product is a stable, high quality hard candy which has a satisfactory mouth feel, taste, and flavor, less adsorb moisture, and does neither induce crystallization of sucrose nor cause melting.
  • a gum base Three parts by weight of a gum base were melted by heating to an extent to be softened and then admixed with two parts by weight of anhydrous crystalline maltitol, two parts by weight of xylitol, two parts by weight of a crystalline cyclotetrasaccharide, penta- or hexa-hydrate, obtained by the method in Example A-7, and one part by weight of trehalose, and further mixed with adequate amounts of a flavor and a color.
  • the mixture was in a usual manner kneaded by a roll and then shaped and packed to obtain the desired product.
  • the product thus obtained is a relatively low cariogenic and caloric chewing gum having a satisfactory texture, taste, and flavor.
  • a skim milk powder 130 parts by weight of a syrup containing cyclotetrasaccharide, obtained by the method in Example A-4, and 50 parts by weight of "NYUKAOLIGO ® ", a high lactosucrose content powder commercialized by Hayashibara Shoji Inc., Okayama, Japan, were dissolved in 1,150 parts by weight of water.
  • the resulting solution was sterilized at 65_C for 30 min, then cooled to 40_C, inoculated in a usual manner with 30 parts by weight of lactic acid bacteria as a starter, and incubated at 37_C for eight hours to obtain a beverage with lactic acid bacteria.
  • the product can be suitably used as a lactic acid beverage which has a satisfactory flavor and taste, contains oligosaccharides and cyclotetrasaccharide, stably retains the lactic acid bacteria, and has actions of promoting the growth of the bacteria and control the intestinal conditions.
  • the mixture was pulverized into a minute powder which was then placed in a fluidized-bed granulator adjusted to blow air to 40_C, sprayed with an adequate amount of a concentrated solution enriched with cyclotetrasaccharide as a binder, obtained by the method in Example A-5, granulated for 30 min, weighed, and packed to obtain the desired product.
  • the product is a powdered juice having a fruit juice content of about 30%. Also the product has a high product value as a high quality, low caloric juice because it has no unpleasant taste and smell.
  • One hundred parts by weight of corn starch, 100 parts by weight of cyclotetrasaccharide obtained by the method in Example A-2, 60 parts by weight of trehalose, 40 parts by weight of sucrose, and one part by weight of salt were sufficiently mixed, and then further mixed with 280 parts by weight of fresh eggs, followed by stirring.
  • To the resulting mixture was gradually admixed with 1,000 parts by weight of a boiling milk.
  • the mixture was continued stirring over a fire, and the heating was stopped when the whole contents became semitransparent after the corn starch was completely gelatinized, followed by cooling the resultant, admixing it with a vanilla flavor, and then weighing, injecting, and packing the resultant to obtain the desired product.
  • the product is a high quality custard cream which has a smooth gloss, a satisfactory flavor and taste, and well-inhibited retrogradation of starch.
  • the solidified contents were removed from the mold and packed to obtain the desired product.
  • the product has substantially no hygroscopicity, satisfactory color, gloss, and internal texture; smoothly melts in the mouth; and has a high quality sweetness and a mild taste and flavor. Also the product can be useful as a low cariogenic, low caloric chocolate.
  • Example A-1 To 90 parts by weight of rice powder were added 20 parts by weight of corn starch, 70 parts by weight of anhydrous crystalline maltitol, 50 parts by weight of a powder containing cyclotetrasaccharide obtained by the method in Example A-1, and four parts by weight of pullulan, and the resulting mixture was mixed to homogeneity into a premix of uiro-no-moto.
  • the premix and adequate amounts of matcha (a green tea powder) and water were kneaded and then placed in a container and steamed for 60 min to obtain a uiro with matcha.
  • matcha a green tea powder
  • the product has a satisfactory gloss, mouth feel, flavor, and taste, and it can be suitably used as a long shelf-life low caloric uiro in which the retrogradation of starch is well prevented.
  • the product Since the product has a satisfactory stability, mouth feel, taste, and flavor, and does not substantially has syneresis and excessive color of baking, it can be arbitrarily used as a material for confectioneries such as a bean jam bun, "manju" (a kind of Japanese confectionery with bean jam), bean-jamfilled wafer, and ice cream/candy.
  • the resultant slices were first soaked for seven days in a cold-storage room in a salt solution consisting of 500 parts by weight of water, 100 parts by weight of salt, three parts by weight potassium nitrate, 40 parts by weight of a powder containing cyclotetrasaccharide, penta- or hexa-hydrate, obtained by the method in Example A-5, and an adequate amount of a spice, then washed with cold water in a usual manner, tied up with a string, smoked, cooked, cooled, and packaged to obtain the desired product.
  • a salt solution consisting of 500 parts by weight of water, 100 parts by weight of salt, three parts by weight potassium nitrate, 40 parts by weight of a powder containing cyclotetrasaccharide, penta- or hexa-hydrate, obtained by the method in Example A-5, and an adequate amount of a spice
  • the product is a high quality ham having a satisfactory hue, flavor, and taste.
  • the product having a satisfactory flavor and taste can be arbitrary used as a material for confectioneries such as premixes, sherbets and ice creams, as well as a substantially non-digestible edible fiber and a material for controlling intestinal conditions which are used for fluid diets for oral administration and intubation feeding.
  • Egg yolks prepared from fresh eggs were sterilized at 60-64_C by a plate heater, and one part by weight of the resultant liquid was mixed with four parts by weight of a powder containing anhydrous crystalline cyclotetrasaccharide powder, obtained in accordance with the method in Experiment 25.
  • the resultant mixture was transferred to a vessel and allowed to stand overnight to form a block while the cyclotetrasaccharide was allowing to convert into crystalline cyclotetrasaccharide, hepta- or hexa-hydrate.
  • the block thus obtained was pulverized by a cutter into a powdery egg yolk.
  • the product can be arbitrary used as a material for low caloric confectioneries for premixes, sherbets, ice creams, and emulsifiers, as well as a substantially non-digestible edible fiber and a material for controlling intestinal conditions which are used for fluid diets for oral administration and intubation feeding. Also the product can be arbitrarily used as a skin-beautifying agent, hair restorer, etc.
  • a peel juice of "yuzu” (a Chinese lemon) was admixed with 10 parts by weight of a powder containing anhydrous crystalline cyclotetrasaccharide obtained in accordance with the method in Experiment 25, followed by crystallizing to form crystalline cyclotetrasaccharide, heptaor hexa-hydrate, ageing the formed crystal, and pulverizing the aged crystal to obtain a powder of crystalline cyclotetrasaccharide, hepta- or hexa-hydrate, containing a yuzu peel extract.
  • a bath salt was obtained by mixing five parts by weight of the above powder with 90 parts by weight of grilled salt, two parts by weight of hydrous crystalline trehalose, one part by weight of silicic anhydride, and 0.5 part by weight of " ⁇ G HESPERIDIN", ⁇ -glucosyl hesperidin commercialized by Hayashibara Shoji, Inc., Okayama, Japan.
  • the product is a high quality bath salt enriched with yuzu flavor and used by diluting in hot water by 100-10,000 folds, and it moisturizes and smooths the skin and does not make you feel cold after bath therewith.
  • the resultant solution was admixed with two parts by weight of L-lactic acid, five parts by weight of 1,3-butylene glycol, and 66 parts by weight of refined water, and the resultant mixture was emulsified by a homogenizer and admixed with an adequate amount of a flavor while stirring to obtain a cosmetic cream.
  • the product exhibits an antioxidant activity and has a relatively high stability, and these render it advantageously useful as a high quality sunscreen, skin-refining agent, and skin-whitening agent.
  • a toothpaste was obtained by mixing 45 parts by weight of calcium secondary phosphate, 1.5 parts by weight of sodium lauryl sulfate, 25 parts by weight of glycerine, 0.5 part by weight of polyoxyethylene sorbitan laurate, 15 parts by weight of a syrup containing cyclotetrasaccharide obtained by the method in Example A-2, 0.02 part by weight of saccharine, 0.05 part by weight of an antiseptic, and 13 parts by weight of water.
  • the product has an improved after taste and satisfactory feeling after use without lowering the washing power of the surfactant.
  • the product is a fluid diet which is enriched with substantially non-digestible edible fiber due to cyclotetrasaccharide, and has a satisfactory intestinal-controlling action.
  • One bag of the product is dissolved in about 150-300 ml of water into a fluid diet and arbitrarily used by administering orally or intubationally into nasal cavity, stomach, intestines, etc., to supplement energy to living bodies.
  • Example A-7 To 50 parts by weight of aspirin were sufficiently admixed with 14 parts by weight of a powder of crystalline cyclotetrasaccharide, penta- or hexa-hydrate, obtained by the method in Example A-7, and four parts by weight of corn starch. The resulting mixture was in a usual manner tabletted by a tabletting machine to obtain a tablet, 680 mg each, 5.25 mm in thickness.
  • the tablet processed using the filler-imparting ability of cyclotetrasaccharide, has substantially no hygroscopicity, a sufficient physical strength, and a quite satisfactory degradability in water.
  • the resultant was then sugar coated with a second solution consisting of 65 parts by weight of a fresh preparation of the same powder of crystalline cyclotetrasaccharide, penta- or hexa-hydrate, one part by weight of pullulan, and 34 parts by weight of water, and glossed with a liquid wax to obtain a sugar coated tablet having a satisfactory gloss and appearance.
  • the product has a relatively high shock tolerance and retains its high quality for a relatively-long period of time.
  • Example A-7 To 100 parts by weight of a powder of crystalline cyclotetrasaccharide, penta- or hexa-hydrate, obtained by the method in Example A-7, and 300 parts by weight of maltose was added 50 parts by weight of methanol dissolving three parts by weight of iodine, and further added 200 parts by weight of a 10% (w/v) aqueous pullulan solution to obtain the desired product with an adequate extensibility and adhesiveness.
  • the product is a high-valued ointment in which the dispersion of iodine and methanol is well inhibited by cyclotetrasaccharide and is relatively low in change during storing.
  • the product exerts a sterilizing action by iodine and acts, based on maltose, as an energy-supplementing agent to living cells, it shortens the curing term and well cures the affected parts and surfaces.
  • the present invention relates to a novel ⁇ -isomaltosylglucosaccharide-forming enzyme, and their process and uses, more particularly, to a novel ⁇ -isomaltosylglucosaccharide-forming enzyme, process thereof, microorganisms producing the enzyme, ⁇ -glucosyl-transferring method using the enzyme, a method for forming ⁇ -isomaltosylglucosaccharide, a process for producing cyclotetrasaccharide having the structure of cyclo ⁇ ® 6)- ⁇ -D-glucopyranosyl-(1 ® 3)- ⁇ -D-glucopyranosyl-(1 ® 6)- ⁇ -D-glucopyranosyl-(1 ® 3)- ⁇ -D-glucopyranosyl-(1 ® ⁇ , and a composition comprising the saccharide obtainable therewith.
  • an industrially useful cyclotetrasaccharide having the structure of cyclo ⁇ ® 6)- ⁇ -D-glucopyranosyl-(1 ® 3)- ⁇ -D-glucopyranosyl-(1 ® 3)- ⁇ -D-glucopyranosyl-(1 ® 3)- ⁇ -D-glucopyranosyl-(1 ® ⁇ or a composition comprising the same can be produced on an industrial scale and at a relatively low cost.
  • these cyclotetrasaccharide and the saccharide comprising the same have substantially no or low reducibility, substantially do not cause the amino carbonyl reaction, substantially do not exhibit hygroscopicity, have easily handleability, have mild sweetness, adequate viscosity, moisture-retaining ability, inclusion ability, and substantially no digestibility, it can be advantageously used in a variety of compositions such as food products, cosmetics, pharmaceuticals as a sweetener, material for low caloric foods, taste-improving agent, flavor-improving ability, quality-improving agent, syneresis-preventing agent, stabilizer, filler, inclusion agent, and base for pulverization.
  • the present invention having these outstanding functions and effects, is a significantly important invention that greatly contributes to this art.

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CN101260419B (zh) 2013-07-17
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US20080032350A1 (en) 2008-02-07
US7718404B2 (en) 2010-05-18
ATE549402T1 (de) 2012-03-15
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CN1392900A (zh) 2003-01-22
JP4919199B2 (ja) 2012-04-18
US7241606B2 (en) 2007-07-10
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CA2385465A1 (en) 2002-02-07
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US7811797B2 (en) 2010-10-12
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AU781630B2 (en) 2005-06-02
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US20030194762A1 (en) 2003-10-16

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